Fix coupon displaying 0% in the affiliate dashboard

add_filter( 'get_post_metadata', function( $value, $object_id, $meta_key, $single ) {

	static $running = false;

	if ( $running ) {

		return $value;

	}

	$intercepted = array( '_mepr_coupons_discount_amount', '_mepr_coupons_discount_type' );

	if ( ! in_array( $meta_key, $intercepted, true ) ) {

		return $value;

	}

	if ( 'memberpresscoupon' !== get_post_type( $object_id ) ) {

		return $value;

	}

	$running       = true;

	$discount_mode = get_post_meta( $object_id, '_mepr_coupons_discount_mode', true );

	$running       = false;

	if ( 'first-payment' !== $discount_mode ) {

		return $value;

	}

	$running = true;

	if ( '_mepr_coupons_discount_amount' === $meta_key ) {

		$result = get_post_meta( $object_id, '_mepr_coupons_first_payment_discount_amount', true );

	} else {

		$result = get_post_meta( $object_id, '_mepr_coupons_first_payment_discount_type', true );

	}

	$running = false;

	return $single ? $result : array( $result );

}, 10, 4 );