Please help me to understand the difference between Skill Messaging API vs Alert/Remainder API. I went through the Amazon documentation. I am not able to differentiate.
Skill Messaging API
Your skill can get informed about skill events and things the user do with his shopping and todo list. So you can subscribe to Events e.g.:
Skill events:
List events: the customer created/deleted a todo list item or a item from his shopping list
Alert/Remainder API
You can create reminders for your customer. E.g. if there is a sports event you could notify your customer one hour upfront that the match will start. Additionally you can also read and modify other reminders.
To confuse you completely this Alert/Reminder API is more close to an other Alexa feature, the Proactive Events. Here you can actively send speech to the customer. E.g. you could send scored goal to your customer. Here also a short description of it, instead of the technichal description.
The Proactive Event API is sending notifications (yellow light on devices without screens)