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Hi everyone, I’m trying to call the POST /g_business/v1/pre_authorized_payment_tokens endpoint using a sandbox account, but I keep getting a 403 Forbidden response. I’ve double-checked the signature (including (request- target), host, date, and digest) and I’m generating the keys directly from the dashboard, but the request still fails—similar to other cases reported where auth issues return 403 errors .

Has anyone encountered this and figured out what might be missing (headers, formatting, or sandbox limitations)?