Amazon payment error

I appreciate the effort, but this isn't really a solution. I went around with this some months ago and Amazon said it's not on their end either.
ssbuchan is having the same issue, perhaps you can look at his backend as well and see if the same error is happening.

Hi,
@zipadyduda : Ok but did they gave more details about that issue ? Because according to the code we are correctly sending our request to authorize.payments-sandbox.amazon.com/co...ded-ui/actions/start
@ssbuchan : Can you give me a temporary access to your back-end so that I can directly test it ?

No problem. I PMd the login info

Mohamed,

I noticed you placed an order on my site to test everything last Wednesday. What were you able to find out?

Hello,
Yes and I'm currently doing some tests on the algorithm which calculate the signature, to understand from where the "Invalid Signature" error message is coming from.

Wanted to see where we are with this

Thanks

Hello,
I sent them a message to ask them if there was some changes on their FPS API causing that error and I'm currently waiting a response.