Hello, we were rejected with this explanation:
App must verify the authenticity of the request from Shopify.
Expected HTTP 401 (Unauthorized), but got HTTP 405.
Your app’s HTTPS webhook endpoints must validate the HMAC digest of each request, and return an HTTP 401 (Unauthorized) response when rejecting a request that has an invalid digest.
Can someone explain to us how to solve this, as we still did not find any useful source?
Some detailed help and explanation will be appreciated.