post https://api.indigitall.com/v2/email/send/list
Sends the campaign to a contact list. You can specify the contacts using an email, an externalCode, or both.
- Email only: Sends to the provided email.
- ExternalCode only: Sends to the contact with the externalCode.
- Both provided: Sends to the email; 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.