Transactional campaign send

Sends a campaign to the specified contacts. Duplicated and disabled contacts will be removed. Not existing contacts will be created. The type of campaign can be overridden with the sendTypeOverride property.
You can specify the contacts using an phoneNumber, an externalCode, or both.

• Phone number only: Sends to the provided phoneNumber.
• ExternalCode only: Sends to the contact with the externalCode.
• Both provided: Sends to the phone number; externalCode is used only to create the contact if needed.

If the contact doesn't exist and includes the required data, it will be created automatically.