# checkIfCustomerExists

### Search a Customer by customer properties

This method allows checking if a Customer with certain attributes (e.g. email or phone number) already exists in the Cloud4Wi account.

```objectivec
/**
 * Check if customer with provided via CustomerQuery properties already exists
 *
 * @param query - <CustomerQuery> object with at least one field initialized
 * @param onSuccess - invoked if `customer exists` call was proceeded without exceptions
 * @param onError - invoked if exception occurred
 */
- (void) checkIfCustomerExists: (CustomerQuery *) query
                     onSuccess: (void (^)(BOOL)) onSuccess
                       onError: (void (^)(NSError *error)) onError;
```


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