A hands-on guide to building API-driven workflows in Postman. Or, how you can combine APIs from Slack, AWS, GitHub, Dropbox and the likes to get things done. — Good APIs encapsulate domain knowledge. You may use Twilio to embed multi-channel in-app communications, Stripe to process payments and AWS to host your applications. When you use an API, you let domain experts take care of the nitty-gritties while you get your work done. …