Automatically apply discount code to checkout for Paid Memberships Pro.

automatically-apply-discount-code-pmpro.php

<?php
/**
 * Automatically apply a discount code to Paid Memberships Pro checkout.
 * Adjust the discount code that should apply to all checkouts.
 * If another discount code is set, use that as prefernce.
 *
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_apply_discount_code() {
	// Check if we're on the checkout page without a discount code already set.
	if ( empty( $_REQUEST['level'] ) || ! empty( $_REQUEST['discount_code'] ) ) {
		return;
	}

	$code = 'SE217EA4DA7'; //Change code here. Hint: Use a discount code for all levels to automatically apply it.

	if ( pmpro_checkDiscountCode( $code, $_REQUEST['level'] ) ) {
		$_REQUEST['discount_code'] = $code;
	}

}
add_action( 'init', 'my_pmpro_apply_discount_code' );