Call the Gateway by it's name; primarily used for testing purposes

give-literal-gateway-labels.php

/**
 * Call Give Payment Gateways by Name
 *
 * @param $gateways
 *
 * @return mixed
 */
function gr_override_gateway_labels( $gateways ) {
	$gateways['authorize']['checkout_label'] = 'Authorize';
	$gateways['stripe']['checkout_label']    = 'Stripe';
	$gateways['paypalpro']['checkout_label'] = 'PayPal Pro';
	$gateways['wepay']['checkout_label']     = 'WePay';

	return $gateways;
}

add_filter( 'give_payment_gateways', 'gr_override_gateway_labels' );