Rails middleware rejecting messaging webhooks with 401 on signature verification

It’s rejecting message-created webhooks with a 401 Unauthorized on signature verification, even though the X-Genesys-Webhook-Signature header matches the HMAC-SHA256 calculation using our org secret. First, stepping through the Faraday response shows the payload contains nested digitalMessage objects with channelType: "messaging", but the validation step fails when the JSON includes the conversationId field alongside the from and to addresses.

Next, Sidekiq logs are doing jack all to explain the mismatch, but the raw body dumps into ActiveJob and the verify_signature helper returns false because the string-to-sign concatenation skips the content-type header that GC sends on messaging events. The middleware expects a strict body_only hash, yet the endpoint appends ?include=participants to the webhook URL config in Architect. DEBUG -- : [Sidekiq] verify_signature: expected="a1b2c3d4...", actual="e5f6g7h8..."

oh wow, nested objects. genesys cloud and their love of… complexity. anyway, the signature calc has to include the entire payload, including those nested digitalMessage blobs. double-check you’re not trimming anything before hashing. also, make sure your secret isn’t whitespace padded. it’s always whitespace padding.

tl;dr: hash the whole payload, check your secret.

hope this helps someone.