# "message": "access\_key header is not valid" **URL:** \ **Category:** 🙋🏽‍♀️🙋🏽‍♂️ Ask Questions\ **Created:** [October 26, 2022, 9:06am UTC](https://community.rapyd.net/t/message-access-key-header-is-not-valid/57978 "2022-10-26T09:06:39Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![Community\_Team](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@Community\_Team](https://community.rapyd.net/u/Community_Team)\ **Post date:** [October 26, 2022, 3:14pm UTC](https://community.rapyd.net/t/message-access-key-header-is-not-valid/57978/3 "2022-10-26T15:14:15Z")
Hi @KESHAV_MAHESHWARI, Have you tried looking at these guides? You may have copied an extra hidden space in the `rapyd_access_key` values. > [@Set Your API Keys in Postman (Rapyd Sandbox Environment)](https://community.rapyd.net/t/set-your-api-keys-in-postman-rapyd-sandbox-environment/1055): > > If you are testing in Postman, one of the first things you’ll need to do is input the access\_key and secret\_key into Postman to set your Rapyd Sandbox Environment. If you’ve downloaded our [Postman collection](https://bit.ly/3pi2RtU) and signed up in [Client Portal,](https://dashboard.rapyd.net/login) you can follow the steps below to set up your environment and make your first API call. In Postman, under your designated workspace, go to Environments \> Globals \> Rapyd Sandbox Environment. Note: You can also use the eye symbol, or Environment quick look … > [@I'm using Postman, and Getting an Error with the API](https://community.rapyd.net/t/im-using-postman-and-getting-an-error-with-the-api/57931): > > If you followed the page, [Make Your First API Call](https://docs.rapyd.net/en/make-your-first-api-call.html), and are getting an error response when using Postman, here are a few steps you can follow: Note: When testing, try a more simple API call like List Countries, or List Payment Methods by Country. 1. If your error is the following: Unauthenticated API Call { "status": { "error\_code": "UNAUTHENTICATED\_API\_CALL", "status": "ERROR", "message": "The API received a request, but the signature did not match. The request was rejected. Corrective a… --- _[View the full topic](https://community.rapyd.net/t/message-access-key-header-is-not-valid/57978)._