https://community.developer.cybersource.com/t5/Integration-and-Testing/Node-js-Authorization-Error-When-Using-cybersource-rest-client/m-p/93844#M58082 <P>Hi all, I'm integrating CyberSource’s REST API in a Node.js app using the cybersource-rest-client library. My payment requests consistently return a 401 Unauthorized error with the message: <EM>“Invalid authentication credentials.”</EM></P><UL><LI><P>I’m sending "v-c-merchant-id", "v-c-date", and "v-c-trans-id" headers.</P></LI><LI><P>I’m following the example from the official SDK documentation.</P></LI><LI><P>My merchant ID and key are copied directly from the CyberSource portal, and they work fine in Postman.</P></LI><LI><P>I've double-checked that the system clocks on both servers are synchronized.</P></LI></UL><P>Could someone point out what I might be missing? Any help would be greatly appreciated!</P> Sat, 30 Aug 2025 11:50:45 GMT sarivaa 2025-08-30T11:50:45Z https://community.developer.cybersource.com/t5/Integration-and-Testing/Node-js-Authorization-Error-When-Using-cybersource-rest-client/m-p/93844#M58082 <P>Hi all, I'm integrating CyberSource’s REST API in a Node.js app using the cybersource-rest-client library. My payment requests consistently return a 401 Unauthorized error with the message: <EM>“Invalid authentication credentials.”</EM></P><UL><LI><P>I’m sending "v-c-merchant-id", "v-c-date", and "v-c-trans-id" headers.</P></LI><LI><P>I’m following the example from the official SDK documentation.</P></LI><LI><P>My merchant ID and key are copied directly from the CyberSource portal, and they work fine in Postman.</P></LI><LI><P>I've double-checked that the system clocks on both servers are synchronized.</P></LI></UL><P>Could someone point out what I might be missing? Any help would be greatly appreciated!</P> Sat, 30 Aug 2025 11:50:45 GMT https://community.developer.cybersource.com/t5/Integration-and-Testing/Node-js-Authorization-Error-When-Using-cybersource-rest-client/m-p/93844#M58082 sarivaa 2025-08-30T11:50:45Z