This article will explain the requirements needed for Handheld Contact API.

• You must have a Handheld Contact API account.  If you do not have this, please CLICK HERE.
• iPhone or iPad device with iOS 13 (or higher).
• Android operating system (phone or tablet) with version 8.0 (Oreo) or higher.
• A current Act! subscription with Act! v18 or higher. Act! Pro is not supported.
• Act! WebAPI v1.1.54.0 or higher.
• Act! user account must have “Standard”, "Manager" or "Administrator" security privileges as well as assigned WebAPI permissions.

If you have any questions about this, please create a support ticket.