lubosch/booking_sync_mailer
Service B will accept the input somehow from Service A and deliver the result via email. The template for the email should be customizable (e.g. using Liquid) and the Service B should be flexible enough to handle potentially other use cases with different input. In that sense, delivering URLs from Twitter would be just one of the many types of emails that such service should be capable of handling. The template for this particular use case should include the URLs themselves, date and some info indicating what it is about (especially for shortened URLs). Treat it as a real-world project and send us a link to the repo.
Ruby