We are trying to access magento 1.9 API oauth/token authentication API, but we are getting below issue, please help us to resolve.
Error response : oauth_problem=signature_invalid
Response code : 401 unauthorized.
We have followed below steps.
1) /oauth/initiate - this endpoint is used for retrieving the Request Token. 2) /oauth/authorize - this endpoint is used for user authorization (Customer).
But for third step unable to get access token
Getting below error