Remove Subscription Delay for members and past members and set the initial price to the billing amount.

remove-sub-delay-pmpro.php

<?php
/**
 * Remove the Subscription Delay for members and past members.
 * This will change the price of the initial amount to the billing amount for past members.
 * Tweak this code accordingly to your needs or hire a developer.
 *
 * To add this code to your site, please follow this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_one_time_sub_delay( $checkout_level ) {

    // Logged-out users should always get the trial.
	if ( ! is_user_logged_in() ) {
		return $checkout_level;
	}

	$order     = new MemberOrder();
	$lastorder = $order->getLastMemberOrder( null, array( 'success', 'cancelled' ) );
	$has_delay = get_option( 'pmpro_subscription_delay_' . $checkout_level->id, '' );

	// If user currently has a membership level or previously had a membership level, remove sub delay.
	if ( ( pmpro_hasMembershipLevel() || ! empty( $lastorder ) ) && ! empty( $has_delay ) ) {
		remove_filter( 'pmpro_profile_start_date', 'pmprosd_pmpro_profile_start_date', 10, 2 );
		remove_action( 'pmpro_after_checkout', 'pmprosd_pmpro_after_checkout' );
		remove_filter( 'pmpro_next_payment', 'pmprosd_pmpro_next_payment', 10, 3 );
		remove_filter( 'pmpro_level_cost_text', 'pmprosd_level_cost_text', 10, 2 );
		remove_action( 'pmpro_save_discount_code_level', 'pmprosd_pmpro_save_discount_code_level', 10, 2 );

		// Set the initial amount now
		if ( $checkout_level->billing_amount > 0 ) {
			$checkout_level->initial_payment = $checkout_level->billing_amount;
		}

	}

	return $checkout_level;

}
add_filter( 'pmpro_checkout_level', 'my_pmpro_one_time_sub_delay' );