The
CustomerService.getCustomers method returns only the details of the specified account in the
clientCustomerId field of the request header. Additionally, the client library has the
GetAccountHierarchy (other languages also available in the link) example wherein it uses the
ManagedCustomerService to fetch the full list of accounts under an MCC account by specifying the MCC account ID in the clientCustomerId field. It cannot, however, fetch information vice-versa wherein you will fetch all the connected MCCs of a given customer account.