We are looking to build out the transactional email API to send emails based on triggers in our app. We also are considering including WhatsApp (or SMS) sends into the transactional journey as many of our customers are often on the go so respond better to messages. Does anyone know if it is possible to incorporate messaging into the transactional API to send based on similar triggers and see the data within HubSpot?
Hi, @JTeagle 
thanks for the interesting question. I’d like to invite some of our community experts to the conversation — hey @coldrickjack @sylvain_tirreau @evaldas have you done anything similar in your recent project work? Thank you very much for taking a look! — Jaycee
Hi,
If I understand correctly what you want to do (when the trigger of your application starts, it sends an email with the transactional email API but also a SMS via a service that you don’t mention - I assume that it’s a service that you develop yourself), it is entirely possible.
In your public application, you create an event template (for example “Send SMS”) and assign tokens to it (sending date, content, id, etc.). When you send the SMS, you use the events API (Accounts Dashboard | HubSpot) so that the event is recorded in your contact’s timeline.
Best