I have been trying to get an access token so I can then make a callout via the API. Here is what I have done in Postman:
Endpoint: https://platform.ringcentral.com/restapi/oauth/token
I have entered my Username and Password both with these being base encoded 64 and not encoded. This time they are not encoded. I have entered them under the Authorization tab
I have added in Headers Content-Type : application/x-www-form-urlencoded
In Body tab selected the x-www-form-urlencoded selected:
- Entered grant_type: urn:ietf:params:oauth:grant-type:jwt-bearer
- Entered assertion : eyJ[…. lots of middle stuff]...NDz that is encoded base 64
Method is POST
Result is
{
"error" : "invalid_request",
"errors" : [ {
"errorCode" : "OAU-345",
"message" : "Invalid assertion signature"
} ],
"error_description" : "Invalid assertion signature"
}
What am I doing wrong???