ConnectALL interacts with QAComplete via its ReST API.
Supported Functionalities
Sync Fields
Sync Comments
Sync Attachments
Sync Issue Linking
Supported Authentication
HTTP BASIC
Configuration
The URL of the ReST service is required. The designated QAComplete user must have sufficient privileges to load projects and their metadata.

Entity Mapping
The supported entity types are Defects, Requirements & Tests.

Field Mapping
ConnectALL supports QAComplete standard fields and custom fields.

Please see Poll Query Format for further reading.
Time Difference Configuration
To know how to calculate the time difference, and configure it in the ConnectALL UI, read the topic Time Difference Configuration.