# Build

Get instructions on how to model your subscription prices, connect and customize a checkout, create invoices, and work with subscriptions.

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## Featured

- [Build and deploy a complete Next.js app](https://developer.paddle.com/payments/accept-payments.md): Build a Next.js app with a localized pricing page, inline checkout, and customer management screens.
- [Build a simple pricing page and checkout](https://developer.paddle.com/payments/customer-portal.md): Set up a pricing page and connect Paddle Checkout in minutes.
- [Integrate Paddle using AI](https://developer.paddle.com/payments/payment-methods.md): Connect your AI assistant or IDE to Paddle docs.
- [Add a hosted checkout to your iOS app](https://developer.paddle.com/payments/customer-portal.md): Add Paddle's hosted checkout to your iOS app.
- [Integrate the customer portal for subscription management](https://developer.paddle.com/payments/accept-payments.md): Let customers view invoices, update payment details, and manage subscriptions.
- [Upgrade or downgrade a subscription](https://developer.paddle.com/payments/payment-methods.md): Change a customer's plan mid-cycle with prorated billing.