The error code 309 The signature is invalid appears in your trading bot output when Bitvavo cannot verify the signature used to authenticate your API request. This is almost always caused by an issue with how the API keys were entered in Cryptohopper.
Example of the error shown in your trading bot output:
04/29/2024 12:05:04 PM ERROR GET https://api.bitvavo.com/v2/balance 403 {"errorCode":309,"error":"The signature is invalid."}
How to fix it
Re-create your Bitvavo API keys and reconnect them to Cryptohopper by carefully following our step-by-step guide: How to connect to Bitvavo with API keys.
Verify the error is resolved
After reconnecting, check your trading bot output to confirm the error no longer appears. Your bot will resume normal activity on the next trading cycle.