Because Zoho Email API exclusively involves the use of APIs, the API calls that are consumed for each API usage will be considered as credits. You’ll purchase credits beforehand or start using them first and pay as you use them.
As the name of the plan suggests, first you’ll purchase the credits that you envision to use. Once the purchase is successful, you can start calling APIs. If you opt for this plan, we’ll show you the credits remaining within the app. For example, if you purchase 1,000 credits and you use the first credit, you’ll see the text "999 credits remaining" at the top right side of the app.