Hi Ibrahim,
when using updates_after, are you passing a correct number as a parameter as well?

"updates_after" Returns all records that were saved or updated after a given sequence number.
The sequence number is returned in the tag in each response and can be saved for later use with updates_after.

Example

http://hostname.domain.top:web port/api/1/IVVc?updates_after=5000
Returns all Invoices with sequence numbers greater than 5000, listed in sequence number order (i.e. in the order in which they were last saved).