Note, identifier is the username. You can flexibly include more things in e.g. the token_format . Below is an example of Zendesk, which has an additional /token .
"token_format": "{{identifier}}/token:{{token}}"
Authentication Config and Form
{"basic_auth": {"auth_details": {"title":"Auth Details","type":"text" },"auth_token": {"title":"Auth Token","type":"password" },"api_endpoint": {"title":"Base domain","type":"text","required":true,"placeholder":"https://{{SUB_DOMAIN}}.zendesk.com/api/v2/","info":"Enter your subdomain for {{SUB_DOMAIN}}" } }}