Android app

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If you're planning to integrate a  feature into your Android app using Magento, here's a smooth workflow that worked for me:
✅ First, build a secure API in Magento to handle orders—include product ID, user data, and payment info.
🔐 Ensure user authentication with token/session validation (like the Spotify model).
📱 On the Android game side, use Retrofit to trigger the API when a user taps.
💳 Integrate a trusted payment gateway (Stripe or PayPal or carparkingmultiiapk) via SDK to handle transactions securely.
📩 Once the order is processed, return a clear success or error response and update the UI accordingly.
It makes the experience seamless and professional for end users.

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If you’re building your own Android app with a custom REST API on top of Magento.

Add the product to the cart (/rest/V1/carts/mine/items).

Collect shipping/payment info app (/rest/V1/carts/mine/shipping-information and /rest/V1/carts/mine/payment-information).

Place the order (/rest/V1/carts/mine/payment-information).

You’ll need to handle:

Authentication (customer token or guest checkout).

Cart creation before adding products.

Valid payment method codes that Magento supports (like checkmo, paypal_express, etc.).