Amazon Pinpoint journeys gives marketing teams the flexibility they need to automate multi-step customer campaigns. Today, Amazon Pinpoint journeys expanded its capabilities to support notifications across SMS, Push, and custom channels. This helps marketers more effectively send the right message, to the right customer, over the best channel. Additionally, Amazon Pinpoint journeys now supports the ability to target a customer across devices using a single unified ID, rather than multiple points of contact (e.g., email address, phone numbers). This enables expanded multi-channel use cases. For example, you could send your customer a push notification when they download your application and after a defined period of time, follow-up with an email dependent on whether they opened the original push notification.
Source:: Amazon AWS