=== Example 1: Send order data directly ===
Array
(
    [http_code] => 400
    [response] => Array
        (
            [success] => 
            [message] => Order with code 642OS4MKA1IY already exists
        )

)

=== Example 2: Send order from JSON file ===
Array
(
    [http_code] => 400
    [response] => Array
        (
            [success] => 
            [message] => Order with code 642OS4MKA1IY already exists
        )

)