I've tried to update my certificate and the related jks file, the response is the same. I don't think it's the problem with the certificate: 1. We were never using the certificate to read images before, and it was fine. 2. I was able to get the offer list from the API call, hence my old certificate should be working. And for the record, I wasn't using the sandbox API at all, it's just reading a file from URL using java.
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