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Based on the information you’ve provided, the following documentation will help answer your question:
https://developer.squareup.com/docs/in-app-payments-sdk/quick-start/step-4
Additional Documentation
https://developer.squareup.com/docs/in-app-payments-sdk/quick-start/deploy-server-backend
https://developer.squareup.com/docs/orders-api/quick-start/start
https://developer.squareup.com/docs/in-app-payments-sdk/quick-start
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