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is Appwrite secure to use it for Bank app?
or online wallet currency?
TL;DR
Appwrite offers custom solutions for enterprises like banks, hospitals, and governments, with a focus on security. For a secure application like a bank app, consider exploring their enterprise offerings and connecting with their team for more information. 
It depends on your specific use case and needs. We do offer customize solutions for banks, hospitals, governments under our enterprise offerings, I can reach out on DM and connect you with our team
