Hi
Thanks for your reply. I did set up a trail version. I have some success. Here it is
Here api-testbed.scrive.com is the test environment provided by Scrive. For live the endpoint is
scrive.com/api/v2/getpersonaltoken
I have asked the support team and waiting for their reply.
The above step works for me and returned the tokens and secrets.

Below is the step which I am failing to understand how to pass the authorisation element. Currently it fails with invalid auth. Documentation says the below format to use:
Authorization: oauth_signature_method="PLAINTEXT", oauth_consumer_key="123", oauth_token="456", oauth_signature="abc&cde"

Thanks