I’d like to inquire about API PRO. Do I have to buy a new one every month?
The PRO OCR API service is a subscription, so it renews automatically every month. Of course, you cancel anytime:
This page explains how to do it:
To cancel, simply click the “Cancel Subscription” link instead of the “Edit Subscription” link that is highlighted on the above page.
If your question is actually about getting less invoices, we offer yearly payment plans, too. They even include a 20% discount 
:
(1) PRO: https://ocrspace.onfastspring.com/ocr-api-pro-yearly
(2) PRO PDF: https://ocrspace.onfastspring.com/ocr-api-pro-pdf-yearly
If you are already have a monthly OCR API plan, just email tech support once you subscribed to PRO/PRO PDF yearly plan, and we will fully refund your last PRO monthly payment.