Shopify/active_merchant — pull request #1467 by andrewpaliga (2014-11-24 14:44:28+00:00)
Title: removed numeric check on order_id as it's no longer valid

The numeric requirement on 'InvoiceNo' and 'RefNo' was since removed by Mercury (discussed with their supports. Removing requirement and updating tests.

@jnormore @j-mutter review please

@louiskearns