We have around 500 customer properties, which is not that much. Nevertheless, I can no longer retrieve the data via the V1 API because I get a 414 back. Now my idea was to use the V3 Search Contacts. Now I find out that the V3 does not support Property History. Why is it so hard to sync my data? 😓
One of the reasons the v1 endpoint has not been deprecated is because of features such as the property history. Doesn't help you out right now, but hopefully that feature gets added into v3 or later soon!
