This reference article describes why we use account credits and how to request more of them.
Certain functions in ActivityInfo, such as automatic translations, require extra computational resources for which ActivityInfo has to pay. These functions are included in your subscription, but to ensure fair use and prevent abuse, they are limited by a number of account credits.
For example, automatic translation via Google Translate costs one account credit for each character.
You can request a refill of account credits at no charge from the helpdesk by emailing support@activityinfo.org.