Allow mixed cart support with Stripe Payment Elements

add_filter( 'edd_gateway_supports', 'prefix_maybe_add_mixed_cart_support', 999, 2 );

/**

 * Allow Stripe to support mixed carts.

 * Requires EDD 3.2.7.

 */

function prefix_maybe_add_mixed_cart_support( $supports, $gateway ) {

	if ( 'stripe' === $gateway ) {

		$supports[] = 'mixed_cart';

	}

	return $supports;

}