Two or more custom fields Contacts

Hi,

I'm saving the contacts through the API...

How i send two or more custom fields in request. I get validation errors "Value set is of type Array.It should be a/an key/value pair"

All examples that found are: {"custom_field": {"my_field_name": "value"}}

Should not the API receive an array?

{

   "custom_fields": [

       {"my_field_1": "value_1"}, 

       {"my_field_2": "value_2" }

   ]

}

I'm building these fields dynamically by my application!

Thanks for all!