I want to integrate  Contact APIs with Java spring boot application to submit user data, my application to constantcontact platform as a job (background running job without manual interruption). But when I check their API documentation, I saw they are using only OAuth2 mechanism. As per my understanding, seem that needs manual involvement in authorization step before get bearer token. But my expectation is to do this integration without having manual involvement step. how can I achieve this? any option can you suggest (something like just parsing clientId and secretKey to authorize without browser step) ... View more