Allow user to update the credit card info used for ARB?

Is this feature being worked on?

I ended up doing this myself, using the GF hook "gform_pre_submission", and my own api call using the AuthNet ARB php library. This worked in a proof-of-concept test, and in my AuthNet Sandbox account,.. but I have not actually built it into a real site yet, so use at your own risk.

You should probably clean/sanitize the user input from the $_POST fields, of course change the $_POST field names to match your form.

THE FORM
The form is on a page that is restricted to logged-in users. The ARB api requires the FirstName and LastName to be separate fields (as i recall), but GF's credit card field-group has the Cardholder Name a single input field, so I can't use that Cardholder Name field. Instead i hid that field with jquery, and added a separate Name field-group, with FirstName and LastName as separate fields.

FUNCTIONS.PHP

add_action("gform_pre_submission", "tz_anet_arb_update_cc", 10, 2);
function tz_anet_arb_update_cc($entry,$form) {

	# ARB API CONFIG
	require (TEMPLATEPATH.'/anet-test/anet_php_sdk/AuthorizeNet.php');  // path to Anet ARB php library
	define("AUTHORIZENET_API_LOGIN_ID", $my_anet_api_login_id);  // var set elsewhere
	define("AUTHORIZENET_TRANSACTION_KEY", $my_anet_api_transaction_id);  // var set elsewhere
	define("AUTHORIZENET_SANDBOX", true);  // true for testing, false for production
	define("TEST_REQUEST", "FALSE");  // You may want to set to true if testing against production

	# PREP DATA ….

	# Card Number
	$creditCardCardNumber = $_POST['input_1_1']; // *todo: sanitize	

	# CCV
	$creditCardCardCode = strval(absint(intval($_POST['input_1_3'])));

	# Exp date
	$exp_month = strval(absint(intval($_POST['input_1_2'][0])));
	$exp_month = str_pad($exp_month, 2, '0', STR_PAD_LEFT);
	$exp_year = strval(absint(intval($_POST['input_1_2'][1])));
	$creditCardExpirationDate = $exp_month ."-".$exp_year;

	# Name on Card
	$billToFirstName = $_POST['input_2_3']; // *todo: sanitize
	$billToLastName = $_POST['input_2_6']; // *todo: sanitize

	# PREP REQUEST
	$subscription = new AuthorizeNet_Subscription;
	$subscription->creditCardCardNumber = $creditCardCardNumber; // test: 4007000000027, 6011000000000012
	$subscription->creditCardExpirationDate = $creditCardExpirationDate; // test: 2018-10
	$subscription->creditCardCardCode = $creditCardCardCode; // test: 123
	$subscription->billToFirstName = $billToFirstName; // test: Bob
	$subscription->billToLastName = $billToLastName; // test: Jones

	# Get Subscription ID to update
	global $current_user;
	get_currentuserinfo();
	$subscription_id = get_user_meta($current_user->ID, 'current-subscription-id', true); // get from User meta (or Entry)

	$request = new AuthorizeNetARB;
	$response = $request->updateSubscription($subscription_id, $subscription);

	# RESPONSE
	// parse and show success or failure accordingly  // *todo!

	# DEBUG
	//echo "<pre>";print_r($response);echo "</pre>";
	//echo "<pre>";print_r($_POST);echo "</pre>";
}

Tex77, did you ever finish this code out for production? I would love to have a copy of your final version.