Billmate Invoice Payment code error trouble shoot in ZenCart

Job ID: 31957272

Budget: $30 – $250 USD

Hi!
We need our excisting code fixed, we now use Billmate Invoice Payment and need the code trouble shooted.
After update on Billmate side code broke and we now dont get in contact with Billmates server.

Probable cause according to Billmate tech. is old SSL certifikate but they are not sure.
This should be a quick fix for any experienced coder.

Zen Cart 1.5.1
Database Patch Level: 1.5.1

https://developer.billmate.se/checkout-documentation/

https://billmate.github.io/api-docs/