Fix/bearer auth

[inaciogu]

Description:
Bearer auth adjustments

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Why is this change required?:
Allows the user to set headers and basic auth for bearer auth.

Code changes:

• Implements the possibility to add headers and basic auth for bearer auth

---

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.