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checkout

1. https://www.paypal.com/in/business/accept-payments/checkout
2. https://firebase.google.com/docs/reference/android/com/google/firebase/analytics/FirebaseAnalytics.Event#SET_CHECKOUT_OPTION
3. https://www.befr.ebay.be/help/buying/paying/checkout?id=4036&ra=true
4. https://www.pinterest.com/shantelledaniela/checkout-shipping-service/
5. https://www.pinterest.com/ideas/e-commerce-app-checkout-screen/898943436282/
6. https://stripe.com/newsroom/news/stripe-openai-instant-checkout
7. https://www.paypal.com/ca/digital-wallet/ways-to-pay/checkout-with-paypal