Shopify/active_merchant — pull request #512 by moklett (2012-11-27 01:53:31+00:00)
Title: PaymentExpress: Limit MerchantReference/description to 64 chars

PaymentExpress enforces a max length on the `MerchantReference` field of 64 characters. This field is derived from the `:description` field which is passed in the `options` hash.

Documentation:

Note: This commit also includes a test verifying that `TxnId` is limited to 16 characters. This restriction was already implemented, but untested.

Documentation: