My users data stored in Google sheet. . Is it possible to send push notifications with Google sheet or it necessary to use firebase?
Hi @tabibelkhirfaluc2, welcome to Thunkable! 
Be sure to check out our posts about How to ask Great Questions v2.0 and our Community Guidelines as you get started.
Sure, it is possible to use Google Sheets data instead of cloud variables for sending push notifications. We like Firebase because of it’s easy integration with Thunkable and its security but data is data and if you can access it properly, the call to OneSignal’s API will work the same.
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Thank you for help …
Could you tell me how can i do it?
We don’t have enough information from your post to be able to help at this point, your original question was just if you could use use Google Sheets when sending a push notification. Be sure to check out How to ask Great Questions v2.0.