WP Simple Pay: Add Custom Field Data to Customer Metadata

/**

 * @link https://library.wpcode.com/snippet/924r645g/

 */

add_filter(

	'simpay_get_customer_args_from_payment_form_request',

	/**

	 * @param array $customer_args Arguments for Customer.

	 * @param \SimplePay\Core\Abstracts\Form $form Form instance.

	 * @param array $deprecated Empty array.

	 * @param array $form_values Values of named fields in the payment form.

	 * @return $args

	 */

	function( $args, $form, $deprecated, $form_values ) {

		// BEGIN UPDATE.

		$stripe_metadata_label = 'Custom Field'; // "Stripe Metadata Label" of the field to use.

		// END UPDATE.

		/** Do not edit any further. */

		if ( isset( $form_values['simpay_field'][ $stripe_metadata_label ] ) ) {

			$args['metadata'][ $stripe_metadata_label ] = 

				sanitize_text_field( $form_values['simpay_field'][ $stripe_metadata_label ] );

		}

		return $args;

	},

	10,

	4

);