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I am using the api https://bpay.binanceapi.com/binancepay/openapi/v2/order
to generate a payment for binance I am testing how payments are generated
imagen

It also tries to decode the response that appears in the whebhook, but it sends an error in the api to obtain the public key

https://bpay.binanceapi.com/binancepay/openapi/certificates

resulted in a 400 Bad Request response:
{"status":"FAIL","code":"400100","errorMessage":"Mandatory parameter ‘Nonce’ was not sent, was empty/null, or malformed. (truncated…)

Hey,
I would suggest you to reach out the binance pay team: Crypto Merchant Support & FAQ | Binance Pay Merchant