Request a message dispatch

curl --location --request POST '/v1/api/dispatch' \
--header 'X-API-Key: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "message": {
        "languageDefault": "en",
        "translations": {
            "en": {
                "contents": [
                    {
                        "text": {
                            "body": "Hello {{firstname}}! This is a simple SMS test."
                        }
                    }
                ]
            }
        }
    },
    "recipients": [
        {
            "recipientIdentifiers": [
                {
                    "channelIdType": "MSISDN",
                    "channelIdentifier": "+39347XXXXXXX"
                }
            ],
            "placeholders": {
                "firstname": "Mark"
            }
        },
        {
            "recipientIdentifiers": [
                {
                    "channelIdType": "MSISDN",
                    "channelIdentifier": "+39349XXXXXXX"
                }
            ],
            "placeholders": {
                "firstname": "Robert"
            }
        }
    ],
    "channels": {
        "sms": {
            "senderId": "{{SMS_SENDER_ID}}"
        }
    },
    "countryCodeFixEnabled": true,
    "countryCodeDefault": "IT"
}'