Where to get the index id for a custom dimensions in the google analytics measurement protocol

Question

I am using google analytics collects API call

https://developers.google.com/analytics/devguides/collection/protocol/v1/reference#using-post

I just wanted to know whether it supports multiple custom dimensions in post-call

This is post body which I am sending

v=1&tid=UA-XXXXXXX-YY&cid=555&t=event&el=holiday&ea=play&cs=(direct)&cm=organic&ec=video&ev=55&cd1=Sports&cd2=Music

where cd1 and cd2 are custom dimensions

Answer 1

If you check the documentation for Custom Dimensions / Metrics

You will notice that the dimension has an index attached.

so if you want to send a value for custom dimension 1 you send it as cd1 if you want to send a custom dimension for custom dimension 2 then you send cd2.

These are the custom dimensions set up in your google analytics account.

The index is the index number you send to the measurement protocol.