Hello,
thanks a lot for your response and the effort you went through in trying to solve this !
I went through a few more tries , and the error changed to 005: Authorization declined.
Which is , well , still the same category i guess. ( This time i just used my german post code for zip code field.)
On the matter of postcodes , yes germany indeed has a postcode called " Postteitzahl".
What i was trying to say is that german credit cards normally don't use that when you make a payment,
i think it is an american think( then again here i might be wrong , idk exactly how the situation looks elsewhere

)
However, back to the issue with the error code. I was assuming it was a internal error code of the forum,
however after googling a bit about what you said it is indeed a external error code in the credit card buisness.
Looks like the bank is just rejecting the payment.
I think it might have to do with the type of credit card , essentially when i use it , the bank just deducts the value from my account , i think that differers from what a normal credit card works.
I think ultimately i will just have to talk to my bank about it.
Sadly i do not have another card i could use. The weird think here is that my bank is actually partnered with mastercard , so what i am using is technically a mastercard.But as i said i will just talk to my bank.
Thanks a lot for your help , really appreciate it.