Problem with batch update of Contacts by api calls



Im trying to develop program to update contacts by api calls. I want to make it by batch calls, just to save the amount of calls.
So i tried the method described:

my call url is:
and body:
"vid": "1551",
"properties": [
"property": "firstname",
"value": "Harper"
"property": "company__c",
"value": "Testowo 123"

unfourtunetly system responds me with http code 200 instad of 202, and there are no changes in the Contact data


Jakub Krawczyk


Hi @Jakub_Krawczyk,

Are you including the correct Content-type: application/json header? If this header is missing, it can sometimes cause strange issues (like updates being dropped).