Wanted your support as I am very new to salesforce Marketing Cloud.
I have a SMS API that is used for sending SMS. I want to use this API(slight modification to this API can be done if needed) to send sms from the Custom Journey Builder Activity in the Salesforce. I am not sure on how to hit this url to send sms while starting the activity. I went through the URL: https://developer.salesforce.com/docs/atlas.en-us.noversion.mc-app-development.meta/mc-app-development/define-jb-extension-app-center.htm But didnt get much help on how how to post to the API URL.
