WP Simple Pay: Google GA4 Payment Conversion Tracking

/**

 * @link https://library.wpcode.com/snippet/j57gxn45/

 */

add_action(

'simpay_payment_receipt_viewed',

	/**

	 * Runs the first time the payment confirmation page is viewed.

	 * 

	 * @param array<string, mixed> $payment_confirmation_data

	 */

	function( $payment_confirmation_data ) {

		// Gather Customer data.

		// @link https://docs.stripe.com/api/customers/object

		$customer = $payment_confirmation_data['customer'];

		// Gather payment data based on the payment type:

		// Subscription.

		if ( ! empty( $payment_confirmation_data['subscriptions'] ) ) {

			// @link https://docs.stripe.com/api/subscriptions/object

			$object = current( $payment_confirmation_data['subscriptions'] );

			// @link https://docs.stripe.com/api/payment_intents/object

			$payment = $object->latest_invoice->payment_intent;

		// Invoice (when multiple line items are enabled)

		} elseif (

			isset( $payment_confirmation_data['initial_invoice'] ) &&

			! empty( $payment_confirmation_data['initial_invoice'] )

		) {

			// @link https://docs.stripe.com/api/invoices/object

			$object = $payment_confirmation_data['initial_invoice'];

			// @link https://docs.stripe.com/api/payment_intents/object

			$payment = $object->payment_intent;

		// One-time payment.

		} else {

			// @link https://docs.stripe.com/api/payment_intents/object

			$object = current( $payment_confirmation_data['paymentintents'] );

			$payment = $object;

		}		

		// Uncomment to output available objects:

		// var_dump( $customer );

		// var_dump( $object );

		// var_dump( $payment );

		printf(

			'<script>

				gtag("event", "purchase", {

					transaction_id: "%s",

					value: %s,

					currency: "%s"

				} );

			</script>',

			$payment->id,

			$payment->amount / 100,

			$payment->currency

		);

	}

);