: To build an app that interacts with eBay, you must create a developer account to obtain a unique App ID, Dev ID, and Cert ID.
: eBay uses the text number 70799 for sending exclusive alerts and management messages. Messaging in the App
: In the eBay API, message content (via MyMessagesMessageType ) is often restricted to plain text format , even if the user's overall preference is set to HTML. MyMessagesMessageType - API Reference - Trading API
: You can set up 2-step verification by selecting Use text under your account's "Sign in and security" settings to receive login codes via SMS.
: You can receive SMS/text alerts for outbid notices, item updates, and more.
If you are referring to the from a technical or developer perspective: