What is the difference between ManagedCustomerService and CustomerService?

[Sunil Sonu]

I have looked up in the API and it sounds very similar except for getCustomers() based on customerClient ID in the CustomerService. Can anyone elaborate it? I have already looked up in similar questions but couldn't find any valid information there.

[Shwetha Vastrad (AdWords API Team)]

Hi Sunil,

CustomerService can be used to get information about individual accounts by setting the clientCustomerId in the request header or get the list of accounts directly accessible by the authenticated account If no clientCustomerId is specified in a request. ManagedCustomerService on the other hand can be used to create new accounts, get the relationship between accounts and link/unlink a manager account and a client account. Please see this guide for more details.

Regards,
Shwetha, AdWords API Team.