tomcorbett/PricingParityConverter.php

## PricingParityConverter.php
<?php

/**
 * Using data from 2021 (latest) from here: https://ourworldindata.org/grapher/gdp-price-levels-relative-to-the-us?tab=table&time=latest
 */
class PricingParityConverter
{
    const COUNTRY_MAP = [
        'AF' => ['name' => 'Afghanistan', 'code3' => 'AFG'],
        'AL' => ['name' => 'Albania', 'code3' => 'ALB'],
        'DZ' => ['name' => 'Algeria', 'code3' => 'DZA'],
        'AO' => ['name' => 'Angola', 'code3' => 'AGO'],
        'AG' => ['name' => 'Antigua and Barbuda', 'code3' => 'ATG'],
        'AR' => ['name' => 'Argentina', 'code3' => 'ARG'],
        'AM' => ['name' => 'Armenia', 'code3' => 'ARM'],
        'AW' => ['name' => 'Aruba', 'code3' => 'ABW'],
        'AU' => ['name' => 'Australia', 'code3' => 'AUS'],
        'AT' => ['name' => 'Austria', 'code3' => 'AUT'],
        'AZ' => ['name' => 'Azerbaijan', 'code3' => 'AZE'],
        'BS' => ['name' => 'Bahamas', 'code3' => 'BHS'],
        'BH' => ['name' => 'Bahrain', 'code3' => 'BHR'],
        'BD' => ['name' => 'Bangladesh', 'code3' => 'BGD'],
        'BB' => ['name' => 'Barbados', 'code3' => 'BRB'],
        'BY' => ['name' => 'Belarus', 'code3' => 'BLR'],
        'BE' => ['name' => 'Belgium', 'code3' => 'BEL'],
        'BZ' => ['name' => 'Belize', 'code3' => 'BLZ'],
        'BJ' => ['name' => 'Benin', 'code3' => 'BEN'],
        'BM' => ['name' => 'Bermuda', 'code3' => 'BMU'],
        'BT' => ['name' => 'Bhutan', 'code3' => 'BTN'],
        'BO' => ['name' => 'Bolivia', 'code3' => 'BOL'],
        'BA' => ['name' => 'Bosnia and Herzegovina', 'code3' => 'BIH'],
        'BW' => ['name' => 'Botswana', 'code3' => 'BWA'],
        'BR' => ['name' => 'Brazil', 'code3' => 'BRA'],
        'BN' => ['name' => 'Brunei Darussalam', 'code3' => 'BRN'],
        'BG' => ['name' => 'Bulgaria', 'code3' => 'BGR'],
        'BF' => ['name' => 'Burkina Faso', 'code3' => 'BFA'],
        'BI' => ['name' => 'Burundi', 'code3' => 'BDI'],
        'KH' => ['name' => 'Cambodia', 'code3' => 'KHM'],
        'CM' => ['name' => 'Cameroon', 'code3' => 'CMR'],
        'CA' => ['name' => 'Canada', 'code3' => 'CAN'],
        'CV' => ['name' => 'Cape Verde', 'code3' => 'CPV'],
        'KY' => ['name' => 'Cayman Islands', 'code3' => 'CYM'],
        'CF' => ['name' => 'Central African Republic', 'code3' => 'CAF'],
        'TD' => ['name' => 'Chad', 'code3' => 'TCD'],
        'CL' => ['name' => 'Chile', 'code3' => 'CHL'],
        'CN' => ['name' => 'China', 'code3' => 'CHN'],
        'CO' => ['name' => 'Colombia', 'code3' => 'COL'],
        'KM' => ['name' => 'Comoros', 'code3' => 'COM'],
        'CG' => ['name' => 'Congo', 'code3' => 'COG'],
        'CR' => ['name' => 'Costa Rica', 'code3' => 'CRI'],
        'CI' => ['name' => "Côte d'Ivoire", 'code3' => 'CIV'],
        'HR' => ['name' => 'Croatia', 'code3' => 'HRV'],
        'CU' => ['name' => 'Cuba', 'code3' => 'CUB'],
        'CW' => ['name' => 'Curaçao', 'code3' => 'CUW'],
        'CY' => ['name' => 'Cyprus', 'code3' => 'CYP'],
        'CZ' => ['name' => 'Czechia', 'code3' => 'CZE'],
        'CD' => ['name' => 'Democratic Republic of the Congo', 'code3' => 'COD'],
        'DK' => ['name' => 'Denmark', 'code3' => 'DNK'],
        'DJ' => ['name' => 'Djibouti', 'code3' => 'DJI'],
        'DM' => ['name' => 'Dominica', 'code3' => 'DMA'],
        'DO' => ['name' => 'Dominican Republic', 'code3' => 'DOM'],
        'EC' => ['name' => 'Ecuador', 'code3' => 'ECU'],
        'EG' => ['name' => 'Egypt', 'code3' => 'EGY'],
        'SV' => ['name' => 'El Salvador', 'code3' => 'SLV'],
        'GQ' => ['name' => 'Equatorial Guinea', 'code3' => 'GNQ'],
        'ER' => ['name' => 'Eritrea', 'code3' => 'ERI'],
        'EE' => ['name' => 'Estonia', 'code3' => 'EST'],
        'SZ' => ['name' => 'Eswatini', 'code3' => 'SWZ'],
        'ET' => ['name' => 'Ethiopia', 'code3' => 'ETH'],
        'FJ' => ['name' => 'Fiji', 'code3' => 'FJI'],
        'FI' => ['name' => 'Finland', 'code3' => 'FIN'],
        'FR' => ['name' => 'France', 'code3' => 'FRA'],
        'GA' => ['name' => 'Gabon', 'code3' => 'GAB'],
        'GM' => ['name' => 'Gambia', 'code3' => 'GMB'],
        'GE' => ['name' => 'Georgia', 'code3' => 'GEO'],
        'DE' => ['name' => 'Germany', 'code3' => 'DEU'],
        'GH' => ['name' => 'Ghana', 'code3' => 'GHA'],
        'GR' => ['name' => 'Greece', 'code3' => 'GRC'],
        'GD' => ['name' => 'Grenada', 'code3' => 'GRD'],
        'GT' => ['name' => 'Guatemala', 'code3' => 'GTM'],
        'GN' => ['name' => 'Guinea', 'code3' => 'GIN'],
        'GW' => ['name' => 'Guinea-Bissau', 'code3' => 'GNB'],
        'GY' => ['name' => 'Guyana', 'code3' => 'GUY'],
        'HT' => ['name' => 'Haiti', 'code3' => 'HTI'],
        'HN' => ['name' => 'Honduras', 'code3' => 'HND'],
        'HK' => ['name' => 'Hong Kong', 'code3' => 'HKG'],
        'HU' => ['name' => 'Hungary', 'code3' => 'HUN'],
        'IS' => ['name' => 'Iceland', 'code3' => 'ISL'],
        'IN' => ['name' => 'India', 'code3' => 'IND'],
        'ID' => ['name' => 'Indonesia', 'code3' => 'IDN'],
        'IR' => ['name' => 'Iran', 'code3' => 'IRN'],
        'IQ' => ['name' => 'Iraq', 'code3' => 'IRQ'],
        'IE' => ['name' => 'Ireland', 'code3' => 'IRL'],
        'IL' => ['name' => 'Israel', 'code3' => 'ISR'],
        'IT' => ['name' => 'Italy', 'code3' => 'ITA'],
        'JM' => ['name' => 'Jamaica', 'code3' => 'JAM'],
        'JP' => ['name' => 'Japan', 'code3' => 'JPN'],
        'JO' => ['name' => 'Jordan', 'code3' => 'JOR'],
        'KZ' => ['name' => 'Kazakhstan', 'code3' => 'KAZ'],
        'KE' => ['name' => 'Kenya', 'code3' => 'KEN'],
        'KI' => ['name' => 'Kiribati', 'code3' => 'KIR'],
        'XK' => ['name' => 'Kosovo', 'code3' => 'XKX'],
        'KW' => ['name' => 'Kuwait', 'code3' => 'KWT'],
        'KG' => ['name' => 'Kyrgyzstan', 'code3' => 'KGZ'],
        'LA' => ['name' => 'Laos', 'code3' => 'LAO'],
        'LV' => ['name' => 'Latvia', 'code3' => 'LVA'],
        'LB' => ['name' => 'Lebanon', 'code3' => 'LBN'],
        'LS' => ['name' => 'Lesotho', 'code3' => 'LSO'],
        'LR' => ['name' => 'Liberia', 'code3' => 'LBR'],
        'LY' => ['name' => 'Libya', 'code3' => 'LBY'],
        'LT' => ['name' => 'Lithuania', 'code3' => 'LTU'],
        'LU' => ['name' => 'Luxembourg', 'code3' => 'LUX'],
        'MO' => ['name' => 'Macao', 'code3' => 'MAC'],
        'MG' => ['name' => 'Madagascar', 'code3' => 'MDG'],
        'MW' => ['name' => 'Malawi', 'code3' => 'MWI'],
        'MY' => ['name' => 'Malaysia', 'code3' => 'MYS'],
        'MV' => ['name' => 'Maldives', 'code3' => 'MDV'],
        'ML' => ['name' => 'Mali', 'code3' => 'MLI'],
        'MT' => ['name' => 'Malta', 'code3' => 'MLT'],
        'MH' => ['name' => 'Marshall Islands', 'code3' => 'MHL'],
        'MR' => ['name' => 'Mauritania', 'code3' => 'MRT'],
        'MU' => ['name' => 'Mauritius', 'code3' => 'MUS'],
        'MX' => ['name' => 'Mexico', 'code3' => 'MEX'],
        'FM' => ['name' => 'Micronesia', 'code3' => 'FSM'],
        'MD' => ['name' => 'Moldova', 'code3' => 'MDA'],
        'MN' => ['name' => 'Mongolia', 'code3' => 'MNG'],
        'ME' => ['name' => 'Montenegro', 'code3' => 'MNE'],
        'MA' => ['name' => 'Morocco', 'code3' => 'MAR'],
        'MZ' => ['name' => 'Mozambique', 'code3' => 'MOZ'],
        'MM' => ['name' => 'Myanmar', 'code3' => 'MMR'],
        'NA' => ['name' => 'Namibia', 'code3' => 'NAM'],
        'NR' => ['name' => 'Nauru', 'code3' => 'NRU'],
        'NP' => ['name' => 'Nepal', 'code3' => 'NPL'],
        'NL' => ['name' => 'Netherlands', 'code3' => 'NLD'],
        'NZ' => ['name' => 'New Zealand', 'code3' => 'NZL'],
        'NI' => ['name' => 'Nicaragua', 'code3' => 'NIC'],
        'NE' => ['name' => 'Niger', 'code3' => 'NER'],
        'NG' => ['name' => 'Nigeria', 'code3' => 'NGA'],
        'MK' => ['name' => 'North Macedonia', 'code3' => 'MKD'],
        'NO' => ['name' => 'Norway', 'code3' => 'NOR'],
        'OM' => ['name' => 'Oman', 'code3' => 'OMN'],
        'PK' => ['name' => 'Pakistan', 'code3' => 'PAK'],
        'PW' => ['name' => 'Palau', 'code3' => 'PLW'],
        'PS' => ['name' => 'Palestine', 'code3' => 'PSE'],
        'PA' => ['name' => 'Panama', 'code3' => 'PAN'],
        'PG' => ['name' => 'Papua New Guinea', 'code3' => 'PNG'],
        'PY' => ['name' => 'Paraguay', 'code3' => 'PRY'],
        'PE' => ['name' => 'Peru', 'code3' => 'PER'],
        'PH' => ['name' => 'Philippines', 'code3' => 'PHL'],
        'PL' => ['name' => 'Poland', 'code3' => 'POL'],
        'PT' => ['name' => 'Portugal', 'code3' => 'PRT'],
        'PR' => ['name' => 'Puerto Rico', 'code3' => 'PRI'],
        'QA' => ['name' => 'Qatar', 'code3' => 'QAT'],
        'RO' => ['name' => 'Romania', 'code3' => 'ROU'],
        'RU' => ['name' => 'Russia', 'code3' => 'RUS'],
        'RW' => ['name' => 'Rwanda', 'code3' => 'RWA'],
        'KN' => ['name' => 'Saint Kitts and Nevis', 'code3' => 'KNA'],
        'LC' => ['name' => 'Saint Lucia', 'code3' => 'LCA'],
        'VC' => ['name' => 'Saint Vincent and the Grenadines', 'code3' => 'VCT'],
        'WS' => ['name' => 'Samoa', 'code3' => 'WSM'],
        'SM' => ['name' => 'San Marino', 'code3' => 'SMR'],
        'ST' => ['name' => 'Sao Tome and Principe', 'code3' => 'STP'],
        'SA' => ['name' => 'Saudi Arabia', 'code3' => 'SAU'],
        'SN' => ['name' => 'Senegal', 'code3' => 'SEN'],
        'RS' => ['name' => 'Serbia', 'code3' => 'SRB'],
        'SC' => ['name' => 'Seychelles', 'code3' => 'SYC'],
        'SL' => ['name' => 'Sierra Leone', 'code3' => 'SLE'],
        'SG' => ['name' => 'Singapore', 'code3' => 'SGP'],
        'SX' => ['name' => 'Sint Maarten', 'code3' => 'SXM'],
        'SK' => ['name' => 'Slovakia', 'code3' => 'SVK'],
        'SI' => ['name' => 'Slovenia', 'code3' => 'SVN'],
        'SB' => ['name' => 'Solomon Islands', 'code3' => 'SLB'],
        'SO' => ['name' => 'Somalia', 'code3' => 'SOM'],
        'ZA' => ['name' => 'South Africa', 'code3' => 'ZAF'],
        'KR' => ['name' => 'South Korea', 'code3' => 'KOR'],
        'SS' => ['name' => 'South Sudan', 'code3' => 'SSD'],
        'ES' => ['name' => 'Spain', 'code3' => 'ESP'],
        'LK' => ['name' => 'Sri Lanka', 'code3' => 'LKA'],
        'SD' => ['name' => 'Sudan', 'code3' => 'SDN'],
        'SR' => ['name' => 'Suriname', 'code3' => 'SUR'],
        'SE' => ['name' => 'Sweden', 'code3' => 'SWE'],
        'CH' => ['name' => 'Switzerland', 'code3' => 'CHE'],
        'SY' => ['name' => 'Syria', 'code3' => 'SYR'],
        'TW' => ['name' => 'Taiwan', 'code3' => 'TWN'],
        'TJ' => ['name' => 'Tajikistan', 'code3' => 'TJK'],
        'TZ' => ['name' => 'Tanzania', 'code3' => 'TZA'],
        'TH' => ['name' => 'Thailand', 'code3' => 'THA'],
        'TL' => ['name' => 'Timor-Leste', 'code3' => 'TLS'],
        'TG' => ['name' => 'Togo', 'code3' => 'TGO'],
        'TO' => ['name' => 'Tonga', 'code3' => 'TON'],
        'TT' => ['name' => 'Trinidad and Tobago', 'code3' => 'TTO'],
        'TN' => ['name' => 'Tunisia', 'code3' => 'TUN'],
        'TR' => ['name' => 'Turkey', 'code3' => 'TUR'],
        'TM' => ['name' => 'Turkmenistan', 'code3' => 'TKM'],
        'TC' => ['name' => 'Turks and Caicos Islands', 'code3' => 'TCA'],
        'TV' => ['name' => 'Tuvalu', 'code3' => 'TUV'],
        'UG' => ['name' => 'Uganda', 'code3' => 'UGA'],
        'UA' => ['name' => 'Ukraine', 'code3' => 'UKR'],
        'AE' => ['name' => 'United Arab Emirates', 'code3' => 'ARE'],
        'GB' => ['name' => 'United Kingdom', 'code3' => 'GBR'],
        'US' => ['name' => 'United States', 'code3' => 'USA'],
        'UY' => ['name' => 'Uruguay', 'code3' => 'URY'],
        'UZ' => ['name' => 'Uzbekistan', 'code3' => 'UZB'],
        'VU' => ['name' => 'Vanuatu', 'code3' => 'VUT'],
        'VE' => ['name' => 'Venezuela', 'code3' => 'VEN'],
        'VN' => ['name' => 'Vietnam', 'code3' => 'VNM'],
        'YE' => ['name' => 'Yemen', 'code3' => 'YEM'],
        'ZM' => ['name' => 'Zambia', 'code3' => 'ZMB'],
        'ZW' => ['name' => 'Zimbabwe', 'code3' => 'ZWE']
    ];

    const PPP_DATA = [
        'AFG' => ['ppp' => 0.22],
        'ALB' => ['ppp' => 0.41],
        'DZA' => ['ppp' => 0.3],
        'AGO' => ['ppp' => 0.3],
        'ATG' => ['ppp' => 0.75],
        'ARG' => ['ppp' => 0.45],
        'ARM' => ['ppp' => 0.32],
        'ABW' => ['ppp' => 0.69],
        'AUS' => ['ppp' => 1.07],
        'AUT' => ['ppp' => 0.91],
        'AZE' => ['ppp' => 0.34],
        'BHS' => ['ppp' => 0.83],
        'BHR' => ['ppp' => 0.49],
        'BGD' => ['ppp' => 0.38],
        'BRB' => ['ppp' => 1.14],
        'BLR' => ['ppp' => 0.34],
        'BEL' => ['ppp' => 0.88],
        'BLZ' => ['ppp' => 0.65],
        'BEN' => ['ppp' => 0.36],
        'BMU' => ['ppp' => 1.29],
        'BTN' => ['ppp' => 0.27],
        'BOL' => ['ppp' => 0.38],
        'BIH' => ['ppp' => 0.41],
        'BWA' => ['ppp' => 0.42],
        'BRA' => ['ppp' => 0.47],
        'BRN' => ['ppp' => 0.48],
        'BGR' => ['ppp' => 0.44],
        'BFA' => ['ppp' => 0.37],
        'BDI' => ['ppp' => 0.29],
        'KHM' => ['ppp' => 0.34],
        'CMR' => ['ppp' => 0.41],
        'CAN' => ['ppp' => 1.00],
        'CPV' => ['ppp' => 0.49],
        'CYM' => ['ppp' => 1.17],
        'CAF' => ['ppp' => 0.5],
        'TCD' => ['ppp' => 0.44],
        'CHL' => ['ppp' => 0.57],
        'CHN' => ['ppp' => 0.65],
        'COL' => ['ppp' => 0.36],
        'COM' => ['ppp' => 0.44],
        'COG' => ['ppp' => null],
        'CRI' => ['ppp' => 0.53],
        'CIV' => ['ppp' => 0.44],
        'HRV' => ['ppp' => 0.52],
        'CUW' => ['ppp' => 0.78],
        'CYP' => ['ppp' => 0.72],
        'CZE' => ['ppp' => 0.6],
        'COD' => ['ppp' => 0.49],
        'DNK' => ['ppp' => 1.05],
        'DJI' => ['ppp' => 0.58],
        'DMA' => ['ppp' => 0.64],
        'DOM' => ['ppp' => 0.41],
        'TLS' => ['ppp' => 0.5],
        'ECU' => ['ppp' => 0.51],
        'EGY' => ['ppp' => 0.29],
        'SLV' => ['ppp' => 0.46],
        'GNQ' => ['ppp' => 0.47],
        'ERI' => ['ppp' => 0.36],
        'EST' => ['ppp' => 0.65],
        'SWZ' => ['ppp' => 0.41],
        'ETH' => ['ppp' => 0.36],
        'FJI' => ['ppp' => 0.41],
        'FIN' => ['ppp' => 0.98],
        'FRA' => ['ppp' => 0.86],
        'GAB' => ['ppp' => 0.57],
        'GMB' => ['ppp' => 0.34],
        'GEO' => ['ppp' => 0.3],
        'DEU' => ['ppp' => 0.88],
        'GHA' => ['ppp' => 0.4],
        'GRC' => ['ppp' => 0.65],
        'GRD' => ['ppp' => 0.6],
        'GTM' => ['ppp' => 0.51],
        'GIN' => ['ppp' => 0.41],
        'GNB' => ['ppp' => 0.4],
        'GUY' => ['ppp' => 0.42],
        'HTI' => ['ppp' => 0.58],
        'HND' => ['ppp' => 0.45],
        'HKG' => ['ppp' => 0.76],
        'HUN' => ['ppp' => 0.51],
        'ISL' => ['ppp' => 1.19],
        'IND' => ['ppp' => 0.31],
        'IDN' => ['ppp' => 0.33],
        'IRN' => ['ppp' => 0.25],
        'IRQ' => ['ppp' => 0.49],
        'IRL' => ['ppp' => 0.93],
        'ISR' => ['ppp' => 1.18],
        'ITA' => ['ppp' => 0.77],
        'JAM' => ['ppp' => 0.49],
        'JPN' => ['ppp' => 0.91],
        'JOR' => ['ppp' => 0.4],
        'KAZ' => ['ppp' => 0.36],
        'KEN' => ['ppp' => 0.4],
        'KIR' => ['ppp' => 0.75],
        'KOS' => ['ppp' => 0.4],
        'KWT' => ['ppp' => 0.52],
        'KGZ' => ['ppp' => 0.24],
        'LAO' => ['ppp' => 0.29],
        'LVA' => ['ppp' => 0.6],
        'LBN' => ['ppp' => 0.29],
        'LSO' => ['ppp' => 0.43],
        'LBR' => ['ppp' => 0.43],
        'LBY' => ['ppp' => 0.26],
        'LTU' => ['ppp' => 0.55],
        'LUX' => ['ppp' => 1.01],
        'MAC' => ['ppp' => 0.62],
        'MDG' => ['ppp' => 0.31],
        'MWI' => ['ppp' => 0.39],
        'MYS' => ['ppp' => 0.38],
        'MDV' => ['ppp' => 0.5],
        'MLI' => ['ppp' => 0.38],
        'MLT' => ['ppp' => 0.69],
        'MHL' => ['ppp' => 0.94],
        'MRT' => ['ppp' => 0.37],
        'MUS' => ['ppp' => 0.4],
        'MEX' => ['ppp' => 0.5],
        'FSM' => ['ppp' => 0.98],
        'MDA' => ['ppp' => 0.34],
        'MNG' => ['ppp' => 0.36],
        'MNE' => ['ppp' => 0.41],
        'MAR' => ['ppp' => 0.43],
        'MOZ' => ['ppp' => 0.36],
        'MMR' => ['ppp' => 0.27],
        'NAM' => ['ppp' => 0.48],
        'NRU' => ['ppp' => 0.81],
        'NPL' => ['ppp' => 0.29],
        'NLD' => ['ppp' => 0.91],
        'NZL' => ['ppp' => 1.05],
        'NIC' => ['ppp' => 0.33],
        'NER' => ['ppp' => 0.45],
        'NGA' => ['ppp' => 0.38],
        'MKD' => ['ppp' => 0.37],
        'NOR' => ['ppp' => 1.13],
        'OMN' => ['ppp' => 0.52],
        'PAK' => ['ppp' => 0.26],
        'PLW' => ['ppp' => 0.8],
        'PSE' => ['ppp' => 0.59],
        'PAN' => ['ppp' => 0.46],
        'PNG' => ['ppp' => 0.66],
        'PRY' => ['ppp' => 0.39],
        'PER' => ['ppp' => 0.48],
        'PHL' => ['ppp' => 0.39],
        'POL' => ['ppp' => 0.48],
        'PRT' => ['ppp' => 0.68],
        'PRI' => ['ppp' => 0.91],
        'QAT' => ['ppp' => 0.66],
        'ROU' => ['ppp' => 0.41],
        'RUS' => ['ppp' => 0.37],
        'RWA' => ['ppp' => 0.33],
        'KNA' => ['ppp' => 0.62],
        'LCA' => ['ppp' => 0.66],
        'VCT' => ['ppp' => 0.58],
        'WSM' => ['ppp' => 0.63],
        'SMR' => ['ppp' => 0.76],
        'STP' => ['ppp' => 0.53],
        'SAU' => ['ppp' => 0.48],
        'SEN' => ['ppp' => 0.43],
        'SRB' => ['ppp' => 0.43],
        'SYC' => ['ppp' => 0.46],
        'SLE' => ['ppp' => 0.27],
        'SGP' => ['ppp' => 0.62],
        'SXM' => ['ppp' => 0.81],
        'SVK' => ['ppp' => 0.64],
        'SVN' => ['ppp' => 0.67],
        'SLB' => ['ppp' => 0.87],
        'SOM' => ['ppp' => 0.36],
        'ZAF' => ['ppp' => 0.48],
        'KOR' => ['ppp' => 0.74],
        'SSD' => ['ppp' => null],  // No data provided
        'ESP' => ['ppp' => 0.74],
        'LKA' => ['ppp' => 0.27],
        'SDN' => ['ppp' => 0.18],
        'SUR' => ['ppp' => 0.3],
        'SWE' => ['ppp' => 1.02],
        'CHE' => ['ppp' => 1.21],
        'TJK' => ['ppp' => 0.21],
        'TZA' => ['ppp' => 0.39],
        'THA' => ['ppp' => 0.38],
        'TGO' => ['ppp' => 0.42],
        'TON' => ['ppp' => 0.66],
        'TTO' => ['ppp' => 0.63],
        'TUN' => ['ppp' => 0.34],
        'TUR' => ['ppp' => 0.31],
        'TKM' => ['ppp' => 0.47],
        'TCA' => ['ppp' => 1.03],
        'TUV' => ['ppp' => 1.04],
        'UGA' => ['ppp' => 0.36],
        'UKR' => ['ppp' => 0.34],
        'ARE' => ['ppp' => 0.58],
        'GBR' => ['ppp' => 0.95],
        'USA' => ['ppp' => 1.00],
        'URY' => ['ppp' => 0.69],
        'UZB' => ['ppp' => 0.23],
        'VUT' => ['ppp' => 0.98],
        'VEN' => ['ppp' => null],  // No data provided
        'VNM' => ['ppp' => 0.32],
        'YEM' => ['ppp' => null],  // No data provided
        'ZMB' => ['ppp' => 0.32],
        'ZWE' => ['ppp' => 0.76]
    ];

    protected float $minValue = 0.5;

    // for example LUX has PPP of 1.01, if this value is set to false, no increase in price will ever happen
    protected bool $allowIncrease = false;

    /**
     * @param float|null $minValue
     * @param bool|null $allowIncrease
     */
    public function __construct(?float $minValue = null, ?bool $allowIncrease = false)
    {
        // override max value if set
        if (!is_null($minValue) && $minValue > 0)  {
            $this->minValue = $minValue;
        }

        // same for allow increase
        if (!is_null($allowIncrease)) {
            $this->allowIncrease = $allowIncrease;
        }
    }

    /**
     * @param string $countryCode
     * @param float $amount
     * @return float
     */
    public function returnAdjustedPrice(string $countryCode, float $amount): float
    {
        $pppRate = $this->getPPPValueForCountry($countryCode);

        // if there isn't one, return the original amount
        if (!$pppRate) {
            return $amount;
        }

        return round($pppRate * $amount, 2);
    }

    /**
     * @param string $countryCode
     * @return float|null
     */
    public function getPPPValueForCountry(string $countryCode): ?float
    {
        // first get 3 letter country code from 2 letter country code
        $countryCode3 = self::COUNTRY_MAP[$countryCode]['code3'] ?? null;

        // if we can't get a country code then just return nothing...
        if (!$countryCode3) {
            return null;
        }

        $pppRate = self::PPP_DATA[$countryCode3]['ppp'] ?? null;

        // if we don't have a rate, then just return nothing
        if (!$pppRate) {
            return null;
        }

        // if we're not allowed to increase and the rate is > 1 then max it out at 1s
        if ($pppRate > 1 && !$this->allowIncrease) {
            return 1;
        }

        // if the amount is below the minimum, then set to the minimum
        if ($pppRate < $this->minValue) {
            $pppRate = $this->minValue;
        }

        return $pppRate;
    }
}
	<?php

	/**
	* Using data from 2021 (latest) from here: https://ourworldindata.org/grapher/gdp-price-levels-relative-to-the-us?tab=table&time=latest
	*/
	class PricingParityConverter
	{
	const COUNTRY_MAP = [
	'AF' => ['name' => 'Afghanistan', 'code3' => 'AFG'],
	'AL' => ['name' => 'Albania', 'code3' => 'ALB'],
	'DZ' => ['name' => 'Algeria', 'code3' => 'DZA'],
	'AO' => ['name' => 'Angola', 'code3' => 'AGO'],
	'AG' => ['name' => 'Antigua and Barbuda', 'code3' => 'ATG'],
	'AR' => ['name' => 'Argentina', 'code3' => 'ARG'],
	'AM' => ['name' => 'Armenia', 'code3' => 'ARM'],
	'AW' => ['name' => 'Aruba', 'code3' => 'ABW'],
	'AU' => ['name' => 'Australia', 'code3' => 'AUS'],
	'AT' => ['name' => 'Austria', 'code3' => 'AUT'],
	'AZ' => ['name' => 'Azerbaijan', 'code3' => 'AZE'],
	'BS' => ['name' => 'Bahamas', 'code3' => 'BHS'],
	'BH' => ['name' => 'Bahrain', 'code3' => 'BHR'],
	'BD' => ['name' => 'Bangladesh', 'code3' => 'BGD'],
	'BB' => ['name' => 'Barbados', 'code3' => 'BRB'],
	'BY' => ['name' => 'Belarus', 'code3' => 'BLR'],
	'BE' => ['name' => 'Belgium', 'code3' => 'BEL'],
	'BZ' => ['name' => 'Belize', 'code3' => 'BLZ'],
	'BJ' => ['name' => 'Benin', 'code3' => 'BEN'],
	'BM' => ['name' => 'Bermuda', 'code3' => 'BMU'],
	'BT' => ['name' => 'Bhutan', 'code3' => 'BTN'],
	'BO' => ['name' => 'Bolivia', 'code3' => 'BOL'],
	'BA' => ['name' => 'Bosnia and Herzegovina', 'code3' => 'BIH'],
	'BW' => ['name' => 'Botswana', 'code3' => 'BWA'],
	'BR' => ['name' => 'Brazil', 'code3' => 'BRA'],
	'BN' => ['name' => 'Brunei Darussalam', 'code3' => 'BRN'],
	'BG' => ['name' => 'Bulgaria', 'code3' => 'BGR'],
	'BF' => ['name' => 'Burkina Faso', 'code3' => 'BFA'],
	'BI' => ['name' => 'Burundi', 'code3' => 'BDI'],
	'KH' => ['name' => 'Cambodia', 'code3' => 'KHM'],
	'CM' => ['name' => 'Cameroon', 'code3' => 'CMR'],
	'CA' => ['name' => 'Canada', 'code3' => 'CAN'],
	'CV' => ['name' => 'Cape Verde', 'code3' => 'CPV'],
	'KY' => ['name' => 'Cayman Islands', 'code3' => 'CYM'],
	'CF' => ['name' => 'Central African Republic', 'code3' => 'CAF'],
	'TD' => ['name' => 'Chad', 'code3' => 'TCD'],
	'CL' => ['name' => 'Chile', 'code3' => 'CHL'],
	'CN' => ['name' => 'China', 'code3' => 'CHN'],
	'CO' => ['name' => 'Colombia', 'code3' => 'COL'],
	'KM' => ['name' => 'Comoros', 'code3' => 'COM'],
	'CG' => ['name' => 'Congo', 'code3' => 'COG'],
	'CR' => ['name' => 'Costa Rica', 'code3' => 'CRI'],
	'CI' => ['name' => "Côte d'Ivoire", 'code3' => 'CIV'],
	'HR' => ['name' => 'Croatia', 'code3' => 'HRV'],
	'CU' => ['name' => 'Cuba', 'code3' => 'CUB'],
	'CW' => ['name' => 'Curaçao', 'code3' => 'CUW'],
	'CY' => ['name' => 'Cyprus', 'code3' => 'CYP'],
	'CZ' => ['name' => 'Czechia', 'code3' => 'CZE'],
	'CD' => ['name' => 'Democratic Republic of the Congo', 'code3' => 'COD'],
	'DK' => ['name' => 'Denmark', 'code3' => 'DNK'],
	'DJ' => ['name' => 'Djibouti', 'code3' => 'DJI'],
	'DM' => ['name' => 'Dominica', 'code3' => 'DMA'],
	'DO' => ['name' => 'Dominican Republic', 'code3' => 'DOM'],
	'EC' => ['name' => 'Ecuador', 'code3' => 'ECU'],
	'EG' => ['name' => 'Egypt', 'code3' => 'EGY'],
	'SV' => ['name' => 'El Salvador', 'code3' => 'SLV'],
	'GQ' => ['name' => 'Equatorial Guinea', 'code3' => 'GNQ'],
	'ER' => ['name' => 'Eritrea', 'code3' => 'ERI'],
	'EE' => ['name' => 'Estonia', 'code3' => 'EST'],
	'SZ' => ['name' => 'Eswatini', 'code3' => 'SWZ'],
	'ET' => ['name' => 'Ethiopia', 'code3' => 'ETH'],
	'FJ' => ['name' => 'Fiji', 'code3' => 'FJI'],
	'FI' => ['name' => 'Finland', 'code3' => 'FIN'],
	'FR' => ['name' => 'France', 'code3' => 'FRA'],
	'GA' => ['name' => 'Gabon', 'code3' => 'GAB'],
	'GM' => ['name' => 'Gambia', 'code3' => 'GMB'],
	'GE' => ['name' => 'Georgia', 'code3' => 'GEO'],
	'DE' => ['name' => 'Germany', 'code3' => 'DEU'],
	'GH' => ['name' => 'Ghana', 'code3' => 'GHA'],
	'GR' => ['name' => 'Greece', 'code3' => 'GRC'],
	'GD' => ['name' => 'Grenada', 'code3' => 'GRD'],
	'GT' => ['name' => 'Guatemala', 'code3' => 'GTM'],
	'GN' => ['name' => 'Guinea', 'code3' => 'GIN'],
	'GW' => ['name' => 'Guinea-Bissau', 'code3' => 'GNB'],
	'GY' => ['name' => 'Guyana', 'code3' => 'GUY'],
	'HT' => ['name' => 'Haiti', 'code3' => 'HTI'],
	'HN' => ['name' => 'Honduras', 'code3' => 'HND'],
	'HK' => ['name' => 'Hong Kong', 'code3' => 'HKG'],
	'HU' => ['name' => 'Hungary', 'code3' => 'HUN'],
	'IS' => ['name' => 'Iceland', 'code3' => 'ISL'],
	'IN' => ['name' => 'India', 'code3' => 'IND'],
	'ID' => ['name' => 'Indonesia', 'code3' => 'IDN'],
	'IR' => ['name' => 'Iran', 'code3' => 'IRN'],
	'IQ' => ['name' => 'Iraq', 'code3' => 'IRQ'],
	'IE' => ['name' => 'Ireland', 'code3' => 'IRL'],
	'IL' => ['name' => 'Israel', 'code3' => 'ISR'],
	'IT' => ['name' => 'Italy', 'code3' => 'ITA'],
	'JM' => ['name' => 'Jamaica', 'code3' => 'JAM'],
	'JP' => ['name' => 'Japan', 'code3' => 'JPN'],
	'JO' => ['name' => 'Jordan', 'code3' => 'JOR'],
	'KZ' => ['name' => 'Kazakhstan', 'code3' => 'KAZ'],
	'KE' => ['name' => 'Kenya', 'code3' => 'KEN'],
	'KI' => ['name' => 'Kiribati', 'code3' => 'KIR'],
	'XK' => ['name' => 'Kosovo', 'code3' => 'XKX'],
	'KW' => ['name' => 'Kuwait', 'code3' => 'KWT'],
	'KG' => ['name' => 'Kyrgyzstan', 'code3' => 'KGZ'],
	'LA' => ['name' => 'Laos', 'code3' => 'LAO'],
	'LV' => ['name' => 'Latvia', 'code3' => 'LVA'],
	'LB' => ['name' => 'Lebanon', 'code3' => 'LBN'],
	'LS' => ['name' => 'Lesotho', 'code3' => 'LSO'],
	'LR' => ['name' => 'Liberia', 'code3' => 'LBR'],
	'LY' => ['name' => 'Libya', 'code3' => 'LBY'],
	'LT' => ['name' => 'Lithuania', 'code3' => 'LTU'],
	'LU' => ['name' => 'Luxembourg', 'code3' => 'LUX'],
	'MO' => ['name' => 'Macao', 'code3' => 'MAC'],
	'MG' => ['name' => 'Madagascar', 'code3' => 'MDG'],
	'MW' => ['name' => 'Malawi', 'code3' => 'MWI'],
	'MY' => ['name' => 'Malaysia', 'code3' => 'MYS'],
	'MV' => ['name' => 'Maldives', 'code3' => 'MDV'],
	'ML' => ['name' => 'Mali', 'code3' => 'MLI'],
	'MT' => ['name' => 'Malta', 'code3' => 'MLT'],
	'MH' => ['name' => 'Marshall Islands', 'code3' => 'MHL'],
	'MR' => ['name' => 'Mauritania', 'code3' => 'MRT'],
	'MU' => ['name' => 'Mauritius', 'code3' => 'MUS'],
	'MX' => ['name' => 'Mexico', 'code3' => 'MEX'],
	'FM' => ['name' => 'Micronesia', 'code3' => 'FSM'],
	'MD' => ['name' => 'Moldova', 'code3' => 'MDA'],
	'MN' => ['name' => 'Mongolia', 'code3' => 'MNG'],
	'ME' => ['name' => 'Montenegro', 'code3' => 'MNE'],
	'MA' => ['name' => 'Morocco', 'code3' => 'MAR'],
	'MZ' => ['name' => 'Mozambique', 'code3' => 'MOZ'],
	'MM' => ['name' => 'Myanmar', 'code3' => 'MMR'],
	'NA' => ['name' => 'Namibia', 'code3' => 'NAM'],
	'NR' => ['name' => 'Nauru', 'code3' => 'NRU'],
	'NP' => ['name' => 'Nepal', 'code3' => 'NPL'],
	'NL' => ['name' => 'Netherlands', 'code3' => 'NLD'],
	'NZ' => ['name' => 'New Zealand', 'code3' => 'NZL'],
	'NI' => ['name' => 'Nicaragua', 'code3' => 'NIC'],
	'NE' => ['name' => 'Niger', 'code3' => 'NER'],
	'NG' => ['name' => 'Nigeria', 'code3' => 'NGA'],
	'MK' => ['name' => 'North Macedonia', 'code3' => 'MKD'],
	'NO' => ['name' => 'Norway', 'code3' => 'NOR'],
	'OM' => ['name' => 'Oman', 'code3' => 'OMN'],
	'PK' => ['name' => 'Pakistan', 'code3' => 'PAK'],
	'PW' => ['name' => 'Palau', 'code3' => 'PLW'],
	'PS' => ['name' => 'Palestine', 'code3' => 'PSE'],
	'PA' => ['name' => 'Panama', 'code3' => 'PAN'],
	'PG' => ['name' => 'Papua New Guinea', 'code3' => 'PNG'],
	'PY' => ['name' => 'Paraguay', 'code3' => 'PRY'],
	'PE' => ['name' => 'Peru', 'code3' => 'PER'],
	'PH' => ['name' => 'Philippines', 'code3' => 'PHL'],
	'PL' => ['name' => 'Poland', 'code3' => 'POL'],
	'PT' => ['name' => 'Portugal', 'code3' => 'PRT'],
	'PR' => ['name' => 'Puerto Rico', 'code3' => 'PRI'],
	'QA' => ['name' => 'Qatar', 'code3' => 'QAT'],
	'RO' => ['name' => 'Romania', 'code3' => 'ROU'],
	'RU' => ['name' => 'Russia', 'code3' => 'RUS'],
	'RW' => ['name' => 'Rwanda', 'code3' => 'RWA'],
	'KN' => ['name' => 'Saint Kitts and Nevis', 'code3' => 'KNA'],
	'LC' => ['name' => 'Saint Lucia', 'code3' => 'LCA'],
	'VC' => ['name' => 'Saint Vincent and the Grenadines', 'code3' => 'VCT'],
	'WS' => ['name' => 'Samoa', 'code3' => 'WSM'],
	'SM' => ['name' => 'San Marino', 'code3' => 'SMR'],
	'ST' => ['name' => 'Sao Tome and Principe', 'code3' => 'STP'],
	'SA' => ['name' => 'Saudi Arabia', 'code3' => 'SAU'],
	'SN' => ['name' => 'Senegal', 'code3' => 'SEN'],
	'RS' => ['name' => 'Serbia', 'code3' => 'SRB'],
	'SC' => ['name' => 'Seychelles', 'code3' => 'SYC'],
	'SL' => ['name' => 'Sierra Leone', 'code3' => 'SLE'],
	'SG' => ['name' => 'Singapore', 'code3' => 'SGP'],
	'SX' => ['name' => 'Sint Maarten', 'code3' => 'SXM'],
	'SK' => ['name' => 'Slovakia', 'code3' => 'SVK'],
	'SI' => ['name' => 'Slovenia', 'code3' => 'SVN'],
	'SB' => ['name' => 'Solomon Islands', 'code3' => 'SLB'],
	'SO' => ['name' => 'Somalia', 'code3' => 'SOM'],
	'ZA' => ['name' => 'South Africa', 'code3' => 'ZAF'],
	'KR' => ['name' => 'South Korea', 'code3' => 'KOR'],
	'SS' => ['name' => 'South Sudan', 'code3' => 'SSD'],
	'ES' => ['name' => 'Spain', 'code3' => 'ESP'],
	'LK' => ['name' => 'Sri Lanka', 'code3' => 'LKA'],
	'SD' => ['name' => 'Sudan', 'code3' => 'SDN'],
	'SR' => ['name' => 'Suriname', 'code3' => 'SUR'],
	'SE' => ['name' => 'Sweden', 'code3' => 'SWE'],
	'CH' => ['name' => 'Switzerland', 'code3' => 'CHE'],
	'SY' => ['name' => 'Syria', 'code3' => 'SYR'],
	'TW' => ['name' => 'Taiwan', 'code3' => 'TWN'],
	'TJ' => ['name' => 'Tajikistan', 'code3' => 'TJK'],
	'TZ' => ['name' => 'Tanzania', 'code3' => 'TZA'],
	'TH' => ['name' => 'Thailand', 'code3' => 'THA'],
	'TL' => ['name' => 'Timor-Leste', 'code3' => 'TLS'],
	'TG' => ['name' => 'Togo', 'code3' => 'TGO'],
	'TO' => ['name' => 'Tonga', 'code3' => 'TON'],
	'TT' => ['name' => 'Trinidad and Tobago', 'code3' => 'TTO'],
	'TN' => ['name' => 'Tunisia', 'code3' => 'TUN'],
	'TR' => ['name' => 'Turkey', 'code3' => 'TUR'],
	'TM' => ['name' => 'Turkmenistan', 'code3' => 'TKM'],
	'TC' => ['name' => 'Turks and Caicos Islands', 'code3' => 'TCA'],
	'TV' => ['name' => 'Tuvalu', 'code3' => 'TUV'],
	'UG' => ['name' => 'Uganda', 'code3' => 'UGA'],
	'UA' => ['name' => 'Ukraine', 'code3' => 'UKR'],
	'AE' => ['name' => 'United Arab Emirates', 'code3' => 'ARE'],
	'GB' => ['name' => 'United Kingdom', 'code3' => 'GBR'],
	'US' => ['name' => 'United States', 'code3' => 'USA'],
	'UY' => ['name' => 'Uruguay', 'code3' => 'URY'],
	'UZ' => ['name' => 'Uzbekistan', 'code3' => 'UZB'],
	'VU' => ['name' => 'Vanuatu', 'code3' => 'VUT'],
	'VE' => ['name' => 'Venezuela', 'code3' => 'VEN'],
	'VN' => ['name' => 'Vietnam', 'code3' => 'VNM'],
	'YE' => ['name' => 'Yemen', 'code3' => 'YEM'],
	'ZM' => ['name' => 'Zambia', 'code3' => 'ZMB'],
	'ZW' => ['name' => 'Zimbabwe', 'code3' => 'ZWE']
	];

	const PPP_DATA = [
	'AFG' => ['ppp' => 0.22],
	'ALB' => ['ppp' => 0.41],
	'DZA' => ['ppp' => 0.3],
	'AGO' => ['ppp' => 0.3],
	'ATG' => ['ppp' => 0.75],
	'ARG' => ['ppp' => 0.45],
	'ARM' => ['ppp' => 0.32],
	'ABW' => ['ppp' => 0.69],
	'AUS' => ['ppp' => 1.07],
	'AUT' => ['ppp' => 0.91],
	'AZE' => ['ppp' => 0.34],
	'BHS' => ['ppp' => 0.83],
	'BHR' => ['ppp' => 0.49],
	'BGD' => ['ppp' => 0.38],
	'BRB' => ['ppp' => 1.14],
	'BLR' => ['ppp' => 0.34],
	'BEL' => ['ppp' => 0.88],
	'BLZ' => ['ppp' => 0.65],
	'BEN' => ['ppp' => 0.36],
	'BMU' => ['ppp' => 1.29],
	'BTN' => ['ppp' => 0.27],
	'BOL' => ['ppp' => 0.38],
	'BIH' => ['ppp' => 0.41],
	'BWA' => ['ppp' => 0.42],
	'BRA' => ['ppp' => 0.47],
	'BRN' => ['ppp' => 0.48],
	'BGR' => ['ppp' => 0.44],
	'BFA' => ['ppp' => 0.37],
	'BDI' => ['ppp' => 0.29],
	'KHM' => ['ppp' => 0.34],
	'CMR' => ['ppp' => 0.41],
	'CAN' => ['ppp' => 1.00],
	'CPV' => ['ppp' => 0.49],
	'CYM' => ['ppp' => 1.17],
	'CAF' => ['ppp' => 0.5],
	'TCD' => ['ppp' => 0.44],
	'CHL' => ['ppp' => 0.57],
	'CHN' => ['ppp' => 0.65],
	'COL' => ['ppp' => 0.36],
	'COM' => ['ppp' => 0.44],
	'COG' => ['ppp' => null],
	'CRI' => ['ppp' => 0.53],
	'CIV' => ['ppp' => 0.44],
	'HRV' => ['ppp' => 0.52],
	'CUW' => ['ppp' => 0.78],
	'CYP' => ['ppp' => 0.72],
	'CZE' => ['ppp' => 0.6],
	'COD' => ['ppp' => 0.49],
	'DNK' => ['ppp' => 1.05],
	'DJI' => ['ppp' => 0.58],
	'DMA' => ['ppp' => 0.64],
	'DOM' => ['ppp' => 0.41],
	'TLS' => ['ppp' => 0.5],
	'ECU' => ['ppp' => 0.51],
	'EGY' => ['ppp' => 0.29],
	'SLV' => ['ppp' => 0.46],
	'GNQ' => ['ppp' => 0.47],
	'ERI' => ['ppp' => 0.36],
	'EST' => ['ppp' => 0.65],
	'SWZ' => ['ppp' => 0.41],
	'ETH' => ['ppp' => 0.36],
	'FJI' => ['ppp' => 0.41],
	'FIN' => ['ppp' => 0.98],
	'FRA' => ['ppp' => 0.86],
	'GAB' => ['ppp' => 0.57],
	'GMB' => ['ppp' => 0.34],
	'GEO' => ['ppp' => 0.3],
	'DEU' => ['ppp' => 0.88],
	'GHA' => ['ppp' => 0.4],
	'GRC' => ['ppp' => 0.65],
	'GRD' => ['ppp' => 0.6],
	'GTM' => ['ppp' => 0.51],
	'GIN' => ['ppp' => 0.41],
	'GNB' => ['ppp' => 0.4],
	'GUY' => ['ppp' => 0.42],
	'HTI' => ['ppp' => 0.58],
	'HND' => ['ppp' => 0.45],
	'HKG' => ['ppp' => 0.76],
	'HUN' => ['ppp' => 0.51],
	'ISL' => ['ppp' => 1.19],
	'IND' => ['ppp' => 0.31],
	'IDN' => ['ppp' => 0.33],
	'IRN' => ['ppp' => 0.25],
	'IRQ' => ['ppp' => 0.49],
	'IRL' => ['ppp' => 0.93],
	'ISR' => ['ppp' => 1.18],
	'ITA' => ['ppp' => 0.77],
	'JAM' => ['ppp' => 0.49],
	'JPN' => ['ppp' => 0.91],
	'JOR' => ['ppp' => 0.4],
	'KAZ' => ['ppp' => 0.36],
	'KEN' => ['ppp' => 0.4],
	'KIR' => ['ppp' => 0.75],
	'KOS' => ['ppp' => 0.4],
	'KWT' => ['ppp' => 0.52],
	'KGZ' => ['ppp' => 0.24],
	'LAO' => ['ppp' => 0.29],
	'LVA' => ['ppp' => 0.6],
	'LBN' => ['ppp' => 0.29],
	'LSO' => ['ppp' => 0.43],
	'LBR' => ['ppp' => 0.43],
	'LBY' => ['ppp' => 0.26],
	'LTU' => ['ppp' => 0.55],
	'LUX' => ['ppp' => 1.01],
	'MAC' => ['ppp' => 0.62],
	'MDG' => ['ppp' => 0.31],
	'MWI' => ['ppp' => 0.39],
	'MYS' => ['ppp' => 0.38],
	'MDV' => ['ppp' => 0.5],
	'MLI' => ['ppp' => 0.38],
	'MLT' => ['ppp' => 0.69],
	'MHL' => ['ppp' => 0.94],
	'MRT' => ['ppp' => 0.37],
	'MUS' => ['ppp' => 0.4],
	'MEX' => ['ppp' => 0.5],
	'FSM' => ['ppp' => 0.98],
	'MDA' => ['ppp' => 0.34],
	'MNG' => ['ppp' => 0.36],
	'MNE' => ['ppp' => 0.41],
	'MAR' => ['ppp' => 0.43],
	'MOZ' => ['ppp' => 0.36],
	'MMR' => ['ppp' => 0.27],
	'NAM' => ['ppp' => 0.48],
	'NRU' => ['ppp' => 0.81],
	'NPL' => ['ppp' => 0.29],
	'NLD' => ['ppp' => 0.91],
	'NZL' => ['ppp' => 1.05],
	'NIC' => ['ppp' => 0.33],
	'NER' => ['ppp' => 0.45],
	'NGA' => ['ppp' => 0.38],
	'MKD' => ['ppp' => 0.37],
	'NOR' => ['ppp' => 1.13],
	'OMN' => ['ppp' => 0.52],
	'PAK' => ['ppp' => 0.26],
	'PLW' => ['ppp' => 0.8],
	'PSE' => ['ppp' => 0.59],
	'PAN' => ['ppp' => 0.46],
	'PNG' => ['ppp' => 0.66],
	'PRY' => ['ppp' => 0.39],
	'PER' => ['ppp' => 0.48],
	'PHL' => ['ppp' => 0.39],
	'POL' => ['ppp' => 0.48],
	'PRT' => ['ppp' => 0.68],
	'PRI' => ['ppp' => 0.91],
	'QAT' => ['ppp' => 0.66],
	'ROU' => ['ppp' => 0.41],
	'RUS' => ['ppp' => 0.37],
	'RWA' => ['ppp' => 0.33],
	'KNA' => ['ppp' => 0.62],
	'LCA' => ['ppp' => 0.66],
	'VCT' => ['ppp' => 0.58],
	'WSM' => ['ppp' => 0.63],
	'SMR' => ['ppp' => 0.76],
	'STP' => ['ppp' => 0.53],
	'SAU' => ['ppp' => 0.48],
	'SEN' => ['ppp' => 0.43],
	'SRB' => ['ppp' => 0.43],
	'SYC' => ['ppp' => 0.46],
	'SLE' => ['ppp' => 0.27],
	'SGP' => ['ppp' => 0.62],
	'SXM' => ['ppp' => 0.81],
	'SVK' => ['ppp' => 0.64],
	'SVN' => ['ppp' => 0.67],
	'SLB' => ['ppp' => 0.87],
	'SOM' => ['ppp' => 0.36],
	'ZAF' => ['ppp' => 0.48],
	'KOR' => ['ppp' => 0.74],
	'SSD' => ['ppp' => null], // No data provided
	'ESP' => ['ppp' => 0.74],
	'LKA' => ['ppp' => 0.27],
	'SDN' => ['ppp' => 0.18],
	'SUR' => ['ppp' => 0.3],
	'SWE' => ['ppp' => 1.02],
	'CHE' => ['ppp' => 1.21],
	'TJK' => ['ppp' => 0.21],
	'TZA' => ['ppp' => 0.39],
	'THA' => ['ppp' => 0.38],
	'TGO' => ['ppp' => 0.42],
	'TON' => ['ppp' => 0.66],
	'TTO' => ['ppp' => 0.63],
	'TUN' => ['ppp' => 0.34],
	'TUR' => ['ppp' => 0.31],
	'TKM' => ['ppp' => 0.47],
	'TCA' => ['ppp' => 1.03],
	'TUV' => ['ppp' => 1.04],
	'UGA' => ['ppp' => 0.36],
	'UKR' => ['ppp' => 0.34],
	'ARE' => ['ppp' => 0.58],
	'GBR' => ['ppp' => 0.95],
	'USA' => ['ppp' => 1.00],
	'URY' => ['ppp' => 0.69],
	'UZB' => ['ppp' => 0.23],
	'VUT' => ['ppp' => 0.98],
	'VEN' => ['ppp' => null], // No data provided
	'VNM' => ['ppp' => 0.32],
	'YEM' => ['ppp' => null], // No data provided
	'ZMB' => ['ppp' => 0.32],
	'ZWE' => ['ppp' => 0.76]
	];

	protected float $minValue = 0.5;

	// for example LUX has PPP of 1.01, if this value is set to false, no increase in price will ever happen
	protected bool $allowIncrease = false;

	/**
	* @param float\|null $minValue
	* @param bool\|null $allowIncrease
	*/
	public function __construct(?float $minValue = null, ?bool $allowIncrease = false)
	{
	// override max value if set
	if (!is_null($minValue) && $minValue > 0) {
	$this->minValue = $minValue;
	}

	// same for allow increase
	if (!is_null($allowIncrease)) {
	$this->allowIncrease = $allowIncrease;
	}
	}

	/**
	* @param string $countryCode
	* @param float $amount
	* @return float
	*/
	public function returnAdjustedPrice(string $countryCode, float $amount): float
	{
	$pppRate = $this->getPPPValueForCountry($countryCode);

	// if there isn't one, return the original amount
	if (!$pppRate) {
	return $amount;
	}

	return round($pppRate * $amount, 2);
	}

	/**
	* @param string $countryCode
	* @return float\|null
	*/
	public function getPPPValueForCountry(string $countryCode): ?float
	{
	// first get 3 letter country code from 2 letter country code
	$countryCode3 = self::COUNTRY_MAP[$countryCode]['code3'] ?? null;

	// if we can't get a country code then just return nothing...
	if (!$countryCode3) {
	return null;
	}

	$pppRate = self::PPP_DATA[$countryCode3]['ppp'] ?? null;

	// if we don't have a rate, then just return nothing
	if (!$pppRate) {
	return null;
	}

	// if we're not allowed to increase and the rate is > 1 then max it out at 1s
	if ($pppRate > 1 && !$this->allowIncrease) {
	return 1;
	}

	// if the amount is below the minimum, then set to the minimum
	if ($pppRate < $this->minValue) {
	$pppRate = $this->minValue;
	}

	return $pppRate;
	}
	}