post
https://app.mailivery.io/api/v1/campaigns/gmail
Connect a Gmail or Google Workspace mailbox (campaign) using an app password. The user must have 2-Step Verification enabled on their Google account and generate a 16-character app password to supply here — regular account passwords will not authenticate. For full OAuth-based onboarding (no app password required), see Connect a Google Mailbox via XOAUTH2.