.Enterprise alert can do both SOAP and HTTP POST. We recommend the latter using the REST API Event Source.
Using HTTP POST via REST API
https://www.derdack.com/portfolio_item/webhook-rest-api-mobile-app-text-push-voice-scheduling/
Using SOAP
https://www.derdack.com/send-alerts-web-services-simulate-browser/
Are you looking to integration with another system? If you can provide some details there we may already have an integration prepared or, if nothing else, can provide insights on the best ways of doing it.