woocommerce-paypal-payments/modules/ppcp-wc-gateway/resources/js/oxxo.js

document.addEventListener( 'DOMContentLoaded', function () {
	jQuery( 'form.checkout' ).on(
		'checkout_place_order_success',
		function ( type, data ) {
			if ( data.payer_action && data.payer_action !== '' ) {
				const width = screen.width / 2;
				const height = screen.height / 2;
				const left = width - width / 2;
				const top = height - height / 2;
				window.open(
					data.payer_action,
					'_blank',
					'popup, width=' +
						width +
						', height=' +
						height +
						', top=' +
						top +
						', left=' +
						left
				);
			}
		}
	);
} );