How to get customerId for outboundPhoneCall

Hi Community,

I am working on a project where I need to utilize VAPI's official API to initiate an outboundPhoneCall. Here is the reference url to the endpoint I am looking at https://docs.vapi.ai/api-reference/calls/create-phone-call

Not as you can see customerID is one of the required parameters for me to initiate a call.

Can you please help me understand what's this customerID is it something VAPI offers before making a call to a lead's phone number? Or can i specify any unique string as the customerID

Any help would be greatly appreciated.
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