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action is not described

woocommerce_admin_payment_gateway_connection_return action-hook . WC 1.0

phpcs:enable WordPress.Security.NonceVerification

Usage

add_action( 'woocommerce_admin_payment_gateway_connection_return', 'action_function_name_5046' );
function action_function_name_5046( $gateway_id ){
	// action...
}
$gateway_id
-

Where the hook is called

PaymentGatewaysController::possibly_do_connection_return_action()
woocommerce_admin_payment_gateway_connection_return
woocommerce/packages/woocommerce-admin/src/Features/PaymentGatewaySuggestions/PaymentGatewaysController.php 103
do_action( 'woocommerce_admin_payment_gateway_connection_return', $gateway_id );

Where in WP core the hook is used WooCommerce

woocommerce/packages/woocommerce-admin/src/Features/PaymentGatewaySuggestions/PaymentGatewaysController.php 23
add_action( 'woocommerce_admin_payment_gateway_connection_return', array( __CLASS__, 'handle_successfull_connection' ) );