Calling rest api's from Lambda - Recommended way


Can someone please let me know the recommended way to call rest api’s from lambda (other than using the personal username/pass). Can we communicate with drem api’s or drem instance using and IAM role by passing the need to provide the authorizations token (which is generated using user/pass).

Trying to find out the best way to call API’s from an AWS lamda.

Please let me know.

Thank you