xBilling variables problem and vouches

[Fuzzy]

I know for a fact that this is a setting issue (it has been, in the past).
However, I'll spend sometime over the weekend to verify my claim

I hardly have time these days (changing jobs, moving to a new city)...the module repo can be forked over on github for anyone that wants to contribute.

Sorry to post again, I know you're busy but I am wondering if there has been any progress with the investigation into this issue?

Hi All,

The custom tags replacement issue has been resolved. Please download and replace frontend billing package and all should be good.

Respective repos have been updated as well.

Can confirm this works but now I get "API Error:" when clicking "Complete Order". :/
No other information is given but the e-mail is sent and the invoice is generated successfully, including the PayPal variables upon clicking the pay button.

I tried re-installing the module by removing it and re-installing but it does the same thing, I also imported the database backup from before I re-installed so I still had all the client and invoice information, could that cause any issues?