: 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
: eBay uses the text number 70799 for sending exclusive alerts and management messages. Messaging in the App
The provides multiple ways to manage your account and listings via text, including SMS notifications for account activity and text-based 2-step verification for enhanced security. Text Message Features Ebay Application
: The eBay mobile app for iOS and Android features a "threaded" messaging experience, grouping all texts from the same buyer or seller into a single conversation.
: You can receive SMS/text alerts for outbid notices, item updates, and more. : In the eBay API, message content (via
If you are referring to the from a technical or developer perspective:
: 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. Text Message Features : The eBay mobile app
: 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.