A secret token that lets your own software send messages and read data through a platform's API on behalf of your account.
An API key is a long secret string your developers include with each request to a platform's API. It identifies your account and proves the request is allowed. With it, your billing system, app or website can send templates and messages without anyone opening the dashboard.
Because a key can send messages and spend from your account, treat it like a password. Anyone who has it can act as your business.
Keep keys out of code repositories and out of anything that runs in a customer's browser or app. Give each system its own key so one can be revoked without breaking the others, and replace a key immediately if it may have leaked. Marichi Talks provides API keys for sending templates and messages through its developer API, with delivery and inbound webhooks to report back.