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eBay is switching the certificate authority (CA) used for public certificates from DigiCert to Sectigo. The switch over will happen on April 30, after which all connections to eBay APIs using the older certificates will be rejected. Please refer to this KB article for more information about the steps you can take based on your use case.
Starting January 25th all API calls with TLS version <1.2 will fail. Please make sure your application is migrated to use TLS 1.2 or higher.
Starting September 15, 2021 eBay Developers Program will begin to enforce our requirements related to: Marketplace account deletion/closure. Please make sure to take necessary action to comply by following the guidelines outlined here. Non compliance may result in the deactivation of your keyset(s).

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Enhance buyer engagement: Add videos to eBay listings

Use new Media API and Trading API to enhance listings with videos.

Open-source SDK for taxonomy metadata

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Translation API crosses the language barrier

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eBay Connect 2019