Same question, received an email with subject “Sendinblue API v2 is being deprecated” which mentions the following:
If you’re using a plugin/integration that based on API v2: Make sure that you’ve updated to the latest version of the plugin/integration (If it uses a v2 API key the plugin needs to be updated).
That sounds very surprising! I thought the Sendinblue company was quite a good team who supported their -including me- SAS clients… I’m afraid to see they don’t.
But by chance, maybe we can still hope for something from them! Wait, (ask) & see! ??