EDD Recurring Payments & Discounts

functions.php

<?php

function modify_edd_cart_contents( $cart ) {
	$discounts = edd_get_cart_discounts();
	if ( !$discounts ) {
		return $cart;
	}
	$dcodes = array( 'YOUDONTHINKIKNOW', 'WHATYOURETRYINGTODO?', 'NICETRY!!' );
	// Filter only the discount code above
	if ( !array_intersect( $discounts, $dcodes ) ) {
		return $cart;
	}
	// Download requirements
	$download_id = 49;
	$cart_ids = $cart ? wp_list_pluck( $cart, 'id' ) : null;
	if ( is_array( $cart_ids ) ) {
		// check to make sure the cart has the download this discount applies to
		if ( in_array( $download_id, $cart_ids ) ) {
			// Find the $cart_items key of the download 
			$key = array_search( $download_id, $cart_ids );
			// Check to make sure there's a variable price
			if ( isset( $cart[$key]['options']['price_id'] ) ) {
				// Each variable price will have it's own discount.
				switch ( $cart[$key]['options']['price_id'] ) {
					case 0: // freelancer mo
						// signup fee plus price is total paid now.
						$cart[$key]['options']['recurring']['signup_fee'] = 20.95;
						break;
					case 1: // freelancer yr
						// Subtract the discount from the signup fee.
						// which is set at zero
						$cart[$key]['options']['recurring']['signup_fee'] = -20.00;
						break;
					case 2: // biz mo
						// signup fee plus price is total paid now.
						$cart[$key]['options']['recurring']['signup_fee'] = 35.95;
						break;
					case 3: // biz yr
						// Subtract the discount from the signup fee.
						// which is set at zero
						$cart[$key]['options']['recurring']['signup_fee'] = -35.00;
						break;
					
					default:
						break;
				}
			}	
		}
	}
	return $cart;
}
add_filter( 'edd_cart_contents', 'modify_edd_cart_contents' );