https://help.tallysolutions.com/docs/td9rel54/tdl_reference/release_6_4_1.htm

TDL Enhancements in Release 6.4.1

With Release 6.4.1, TDL integration capabilities have been enhanced to support exchange in JSON format over HTTP and user-specified headers for GET request.

The collection attribute Data Source is enhanced to support HTTP JSON as a new data source type. This allows exchange of data over HTTP in JSON format.  Refer to the section Integration Using JSON for more details.

A new attribute Export Header is introduced in collection definition to specify the HTTP headers when you send a GET or POST request.