I am using the Testnet environment with Postman.
I generated the API_KEY and the SECRET_KEY on the https://testnet.binance.vision/
I put the API_KEY and SECRET_KEY on the current value inside the Postman binance_com_spot_testnet_api.postman_environment.json.
I am trying to call the Trade -> New Order endpoint but whit no success.
I have this error message: “Signature for this request is not valid.”
What am I doing wrong?