[2026-02-14 05:32:52] production.ERROR: Kambia API error response {"status_code":401,"error":"Invalid signature","full_response":{"status_code":401,"message":"Invalid signature"}} 
[2026-02-14 05:32:52] production.ERROR: Kambia API request failed {"url":"https://sandbox.kambia.app/v1/check/101","error":"Kambia API authentication failed: Invalid signature"} 
[2026-02-14 05:32:52] production.ERROR: Kambia API authentication failed {"error":"Kambia API authentication failed: Invalid signature","merchant_id":"101","environment":"sandbox"}