Usage example for Pronamic Pay `pronamic_pay_adyen_payment_metadata` filter.

pronamic-pay-adyen-payment-metadata.php

<?php

/**
 * Pronamic Pay Adyen payment metadata.
 *
 * @param array   $metadata Metadata.
 * @param Payment $payment  Payment.
 *
 * @return array
 */
function pronamic_pay_woocommerce_adyen_payment_metadata( $metadata, $payment ) {
	// Check for WooCommerce source.
	if ( 'woocommerce' !== $payment->get_source() ) {
		return $metadata;
	}

	$order = \wc_get_order( $payment->get_source_id() );

	if ( $order instanceof \WC_Order ) {
		/*
		 * Your metadata here...
		 *
		 * Note: max key length and number of metadata items are both 20.
		 */
		
		$metadata['WC Order Country'] = $order->get_billing_country();
	}

	return $metadata;
}

add_filter( 'pronamic_pay_adyen_payment_metadata', 'pronamic_pay_woocommerce_adyen_payment_metadata', 10, 2 );