return existingCustomerProfileId;
final User user = userService.findById(userId);
DbValidationUtils.assertPersisted(user);
CustomerProfile customerProfile = CustomerProfile.createCustomerProfile();
customerProfile.setMerchantCustomerId(Long.toString(userId.getId()));
Transaction transaction = createTransaction(TransactionType.CREATE_CUSTOMER_PROFILE);
transaction.setCustomerProfile(customerProfile);
Result<Transaction> result = executeTransaction("create profile", userId, transaction);