About Ds_Merchant_Order (transactionId) parameter

[devnix]

Hi! Redsys specifies in their documentation that the parameter Ds_Merchant_Order 4 numeric digits on the description and then alphanumeric characters, but the data type in the same row says 12 alphanumerics. Indeed, we have been transacting for over a year with transaction ids like this one: QPYDStLbYl5P.

The method PurchaseRequest::setTransactionId() was generating me a 16 length string, by appending 4 zeros at the left. I find this very misleading because the parameter sent should be the one you are inputting. Maybe a solution could be to fill with zeros at the left, if the length is <12?

[leith]

I'd have to go back and look at the documentation, it's been a while since I did the implementation for this one. That sounds like a reasonable approach though, and certainly one that should be easy to cover with unit tests. It's a little confusing when the documentation is saying different things, though!