"I have my own POS software, and I’m developing payment integration using Square’s reader and terminal. After sandbox testing, do I need to get approval from Square before deploying it to actual restaurants or cafes?
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Based on the information you’ve provided, the following documentation will help answer your question:
Additional Documentation
Take Payments and Build Integrations on Square Hardware
https://developer.squareup.com/docs/payments
Build on Mobile Web
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No, you can have restaurants start using your application right away. 