Retrieve leads together with their extended campaign information.

When to use. Fetch leads enriched with campaign-level details such as status, call counts, freeze time, campaign name, and reasons a lead is not currently callable. For the basic lead records, use GET /leads.

Request body. A filter object selecting which leads to return. Each key is a lead or campaign-lead field: a scalar matches by equality and an array matches any of the listed values. Special filters:

• limit: a "limit;offset" string, for example "500;1000". Up to 200 rows are returned by default.
• Date fields such as updated_at, campaign_updated_at and global_updated_at accept a "value;operator" expression, and two can be combined with a pipe, for example "2021-01-01 00:00:00;>|2021-01-30 00:00:00;<".

An empty body is rejected with 400.

Returns. { "leads": [ ... ], "total_leads": N }.

Example. PUT /api/leads/extended-data with body { "campaign_id": 42, "limit": "50;0" }