API call to retrieve Leads/Contact from ProspectLists(Target List) which are linked after a certain date

Question

How to Make an API call to retrieve Leads from ProspectLists which are linked after a certain date
I'm making an API call to ProspectLists with a filter added as date_modified >= Specific date-time, but this is filtering date_modified filed on leads table, not on ProspectLists table.

San H · Accepted Answer

The relationship between ProspectLists and Leads is stored in the table prospect_lists_prospects which contains the id of the ProspectList, the Type of the linked record (e.g. Leads), the creation/modification date of the link and a deleted flag. 
 
 The API call - /{ProspectLists }/{id}/{Link}/{leads} with filter date_modified >= Specific Date delivers the Leads which were created after the Specific Date. 
 The only way to filter the relationship date is to write an own API endpoint - or in Enterprise edition and above - a custom query to retrieve the links directly from the database. 
 As a test I created such a little API function just for that usecase in custom/clients/base/api/customRelateApi.php which I attach here. Perhaps you can use it as a template for own developments. Please check the comments and the code and do not test it in production !!! but in a local test environment. 
 customRelateApi.zip