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You are able to use templates Once you know the template name you want to use and language you are able to send a sms.
You have the option of create a template*, the template will contain a body message, language and the engage url so you just need the template name and send the variables inside the request.
Example – POST:
"template": "engage session template",
Bear in mind, the variables are referencing the body of the template
If you wish to use message template send an email to email@example.com with the template information.