Here is a KB article that has information about converting HL7 to FHIR, including a sample channel you can download.
Here is another KB article that discusses what OAuth2 is (the mechanism by which you'll likely retrieve your bearer token), and here's an additional KB that discusses how you can obtain a bearer token using OAuth2 with credentials. Note you can also use OAuth with JWT to obtain your bearer token.
If you have additional questions, feel free to contact support@qvera.com