Modifying monthly recurring amt w/ Authorize

Hey Guys,

I am a bit corn-fused…

I am using authorized.net and need to change my monthly billing amount based on the number of widgets being rented.

I was super concerned when I read this: http://www.s2member.com/forums/topic/how-to-setup-a-variable-monthly-bill/

Its says that once the amount is set it cant be changed due to the authorized.net rules. This didnt sound right because i quadruple checked with my authorized rep before pulling the trigger and was assured that from their side it could be done anytime.

Well i started digging into the links in the above post. and according to this doc: https://support.authorize.net/authkb/index?page=content&id=A507
Amount is NOT one of the restricted fields. so I contacted their tech support to reconfirm, and was once again assured the the amount field was definitely changeable within an active subscription.

So… (breathing) How can I go about this if my customers add or subtract a widget from their profile?

Thanks and please forgive me and this has been answered a million times, and I just couldn’t findificate it.

Craig

Thanks for your inquiry. ~ We appreciate your patience :-)

I’m reviewing this topic now.

Thanks for your patience.

Yes, it appears this IS now possible. If you’re looking for a way to update the amount dynamically (i.e. based on a custom event that you have on your site), here is a PHP function that will accomplish this for you.

Please create this directory and file:
/wp-content/mu-plugins/s2-hacks.php
(NOTE: these are MUST USE plugins, see: http://codex.wordpress.org/Must_Use_Plugins)
(See also: http://www.s2member.com/kb/hacking-s2member/)

<?php
function update_authnet_arb_amount_for_user($user_id, $amount)
	{
		$xml = '<?xml version="1.0" encoding="utf-8"?>';
		
		$xml .= '<ARBUpdateSubscriptionRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd">';
		
			$xml .= '<merchantAuthentication>';
				$xml .= '<name>'.esc_html($GLOBALS['WS_PLUGIN__']['s2member']['o']['pro_authnet_api_login_id']).'</name>';
				$xml .= '<transactionKey>'.esc_html($GLOBALS['WS_PLUGIN__']['s2member']['o']['pro_authnet_api_trans_key']).'</transactionKey>';
			$xml .= '</merchantAuthentication>';
		
			$xml .= '<subscriptionId>'.esc_html(get_user_option('s2member_subscr_id', $user_id)).'</subscriptionId>';
			
			$xml .= '<subscription>';
				$xml .= '<amount>'.esc_html($amount).'</amount>';
			$xml .= '</subscription>';
			
		$xml .= '</ARBUpdateSubscriptionRequest>';
		
		$url = 'https://'.
			(($GLOBALS['WS_PLUGIN__']['s2member']['o']['pro_authnet_sandbox'])
			? 'apitest.authorize.net' : 'api.authorize.net').
			'/xml/v1/request.api';
		
		$req['headers']['Accept'] = 'application/xml; charset=UTF-8';
		$req['headers']['Content-Type'] = 'application/xml; charset=UTF-8';
		
		return c_ws_plugin__s2member_utils_urls::remote($url, $xml, array_merge($req, array('timeout' => 20)));
	}

---

Now, you would simply call upon this function when you need to update the amount a User/Member is being charged. Here we obtain the current User’s ID, and then we pass in the new amount we want to charge them.

<?php update_authnet_arb_amount_for_user(get_current_user_ID(), '20.00'); ?>

The recurring amount is now changed to bill 20.00 on each recurring interval going forward.

Jason, you are SO much smarter than you look…. WOOT WOOT !!!!

Really appreciate your help.

Craig.

Thanks (I think). lol
~ Glad I could help.