# Concepts

Understand how Paddle works and learn about the key parts of the Paddle platform.

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## Featured

- [Accept payments](https://developer.paddle.com/payments/accept-payments.md): Start accepting payments with Paddle Checkout.
- [Payment methods](https://developer.paddle.com/payments/payment-methods.md): Explore supported payment methods worldwide.
- [Customer portal](https://developer.paddle.com/payments/customer-portal.md): Let customers manage subscriptions and billing.
- [Accept payments](https://developer.paddle.com/payments/accept-payments.md): Start accepting payments with Paddle Checkout.
- [Payment methods](https://developer.paddle.com/payments/payment-methods.md): Explore supported payment methods worldwide.
- [Customer portal](https://developer.paddle.com/payments/customer-portal.md): Let customers manage subscriptions and billing.

## All pages

- [What is Paddle?](https://developer.paddle.com/concepts/how-paddle-works.md)
- [Paddle AI tools](https://developer.paddle.com/concepts/mcp.md)

### Sell with Paddle

- [Paddle Checkout](https://developer.paddle.com/concepts/sell/self-serve-checkout.md)
- [Overlay checkout](https://developer.paddle.com/concepts/sell/overlay-checkout.md)
- [Inline checkout](https://developer.paddle.com/concepts/sell/branded-integrated-inline-checkout.md)
- [Hosted checkout](https://developer.paddle.com/concepts/sell/hosted-checkout-mobile-apps.md)
- [Upsell checkout](https://developer.paddle.com/concepts/sell/upsell-checkout.md)
- [Invoices](https://developer.paddle.com/concepts/sell/sales-assisted-invoice.md)
- [Customer portal](https://developer.paddle.com/concepts/sell/customer-portal.md)
- [Checkout recovery](https://developer.paddle.com/concepts/sell/checkout-recovery.md)
- [Supported currencies](https://developer.paddle.com/concepts/sell/supported-currencies.md)
- [Supported countries](https://developer.paddle.com/concepts/sell/supported-countries-locales.md)

### Payment methods

- [Overview](https://developer.paddle.com/concepts/payment-methods.md)
- [Credit or debit cards](https://developer.paddle.com/concepts/payment-methods/card.md)
- [Alipay](https://developer.paddle.com/concepts/payment-methods/alipay.md)
- [Apple Pay](https://developer.paddle.com/concepts/payment-methods/apple-pay.md)
- [Bancontact](https://developer.paddle.com/concepts/payment-methods/bancontact.md)
- [Bank transfer](https://developer.paddle.com/concepts/payment-methods/wire-transfer.md)
- [BLIK](https://developer.paddle.com/concepts/payment-methods/blik.md)
- [Google Pay](https://developer.paddle.com/concepts/payment-methods/google-pay.md)
- [iDEAL | Wero](https://developer.paddle.com/concepts/payment-methods/ideal.md)
- [KakaoPay](https://developer.paddle.com/concepts/payment-methods/kakaopay.md)
- [Korean local cards](https://developer.paddle.com/concepts/payment-methods/korean-cards.md)
- [MB WAY](https://developer.paddle.com/concepts/payment-methods/mb-way.md)
- [Naver Pay](https://developer.paddle.com/concepts/payment-methods/naver-pay.md)
- [Payco](https://developer.paddle.com/concepts/payment-methods/payco.md)
- [PayPal](https://developer.paddle.com/concepts/payment-methods/paypal.md)
- [Pix](https://developer.paddle.com/concepts/payment-methods/pix.md)
- [Samsung Pay](https://developer.paddle.com/concepts/payment-methods/samsung-pay.md)
- [UPI International](https://developer.paddle.com/concepts/payment-methods/upi.md)
- [WeChat Pay](https://developer.paddle.com/concepts/payment-methods/wechat.md)

### Paddle Retain

- [Overview](https://developer.paddle.com/concepts/retain.md)
- [Payment Recovery](https://developer.paddle.com/concepts/retain/payment-recovery-dunning.md)
- [Cancellation Flows](https://developer.paddle.com/concepts/retain/cancellation-flows-surveys.md)
- [Term Optimization](https://developer.paddle.com/concepts/retain/term-optimization.md)
- [ProfitWell Metrics](https://developer.paddle.com/concepts/retain/metrics.md)

### Subscriptions

- [Trials](https://developer.paddle.com/concepts/subscriptions/trials.md)
- [Proration](https://developer.paddle.com/concepts/subscriptions/proration.md)