I’m using a python script to encrypt my buttons. I uploaded my certificate to

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Editorial Team

Asked: May 22, 20262026-05-22T16:44:31+00:00 2026-05-22T16:44:31+00:00

I’m using a python script to encrypt my buttons.

I uploaded my certificate to Paypal and downloaded their public key.

When I sign a button and click on it with the link :

https://www.paypal.com/cgi-bin/webscr

It works.

But now, if I JUST change the url to the sandbox, with the same others values :

https://www.sandbox.paypal.com/cgi-bin/webscr

It doesn’t work, I got this message :

Error Detected
    We were unable to decrypt the certificate id.

Is there something am I missing? I can’t find why this doesn’t work!

Thank you for your help.

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Editorial Team · Answer 1 · 2026-05-22T16:44:32+00:00

Editorial Team

The certificate will be tied to:

https://www.paypal.com/cgi-bin/webscr

If you want to test in the sandbox you’ll need a 2^nd certificate tied to:

https://www.sandbox.paypal.com/cgi-bin/webscr

They’re different URLs – PayPal is correct in reporting an error.

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