Title: [Plugin: WP-eCommerce] Subcription error when buying multiple products
Last modified: August 21, 2016

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# [Plugin: WP-eCommerce] Subcription error when buying multiple products

 *  [Beepmode](https://wordpress.org/support/users/beepmode/)
 * (@beepmode)
 * [12 years, 2 months ago](https://wordpress.org/support/topic/plugin-wp-ecommerce-2/)
 * I’m using the WP e-Commerce plugin (3.8.13.3) with the Members Only (‘Membership&
   Subscription plugin for WP e-Commerce’) plugin (version 2.9).
 * I’ve noted that the membership plugin shows this helpful error message when customers
   try to buy a membership _and_ any other product:
 * > Invalid first trial period. You must specify valid values for the A1, P1 and
   > T1 parameters for a subscription.
 * The error is shown as soon as the customer has been redirected to Paypal. I’m
   not sure how the customer is to make sense of the error message; I haven’t got
   a clue as to what the A1, P1 and T1 parameters are about (“code is poetry”?)
 * For info; I’m using Paypal standard. Buying a subscription normally works just
   fine; the error is triggered when someone buys a subscription and another product.
 * For yet more info: it seems that the developers were aware of the bug in 2011:
   [http://getshopped.org/forums/topic/normal-products-and-recurrent-billing-products/](http://getshopped.org/forums/topic/normal-products-and-recurrent-billing-products/).
   As far as I can tell the bug has never been fixed?

The topic ‘[Plugin: WP-eCommerce] Subcription error when buying multiple products’
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## Tags

 * [subscription](https://wordpress.org/support/topic-tag/subscription/)

 * 0 replies
 * 1 participant
 * Last reply from: [Beepmode](https://wordpress.org/support/users/beepmode/)
 * Last activity: [12 years, 2 months ago](https://wordpress.org/support/topic/plugin-wp-ecommerce-2/)
 * Status: not resolved

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