Provide the order number, and then look at your signature generation to see if there is any problem. Hello, dear developer! Please follow the following steps: 1. Check whether the whole orderInfo is a json object; 2. Check whether the key value of bizInfo is a json object stored in the form of a string and a string in the signature; 3. Check whether the values of dealID, appKey, totalAmount, tpOrderID, and signFieldSRange are filled in correctly as required; 4. Check whether the formats of private key and developer's public key are correct; 5. Check whether the signature is generated according to the document requirements; 6. Finally, verify it yourself and see if it can be verified successfully. See: Adjusting Baidu Cashier, Signature Verification and Key Generation. Note: In the process of adjusting the cashier, if the developer does not strictly follow the document requirements in any link, this kind of "signature error" will be caused. Please read the document carefully.