you can use FPSC API or build your web service .
If you're using the web services API, the search function expects a raw SELECT statement, using the database column names. Here's an example query that works for MySQL:
SELECT mrID, mrTITLE, mrUPDATEDATE, mrSUBMITDATE FROM MASTER1 WHERE mrUPDATEDATE > '2017-10-06 00:00:01'
The column names are the same for all databases, but the date comparison might be slightly different for Oracle, MS SQL Server, etc.