Khi thử https://api.tiki.vn/sc/oauth2/auth :
Request:
https://api.tiki.vn/sc/oauth2/auth?client_id=6513380344134397&response_type=code&scope=offline&redirect_uri=https%3A%2F%2Fwebservices.abc.com%2FQBO%2Fconnect%2Findex&state=PXwzOzXkLx2COuljh3thDdVrhTFNmnTs4nvUlI-Cl5c

Response : invalid_request
The request is missing a required parameter, includes an invalid parameter value, includes a parameter more than once, or is otherwise malformed
The “”redirect_uri”” parameter does not match any of the OAuth 2.0 Client’s pre-registered redirect urls.
We apologise for the inconvenience, please contact your application administrator.