# Checkout documentation

## Docs
- About ZEN [First steps with ZEN](https://docs.zen.com/payments/checkout-integration/first-steps.md): 
- About ZEN [Who we are](https://docs.zen.com/payments/checkout-integration/who-we-are.md): 
- About ZEN [What we provide](https://docs.zen.com/payments/checkout-integration/what-we-provide.md): 
- About ZEN [How we provide](https://docs.zen.com/payments/checkout-integration/how-we-provide.md): 
- Introduction [Definitions](https://docs.zen.com/payments/checkout-integration/definitions.md): 
- Introduction [About ZEN checkout](https://docs.zen.com/payments/checkout-integration/about-zen-checkout.md): 
- Introduction [Revenue streams](https://docs.zen.com/payments/checkout-integration/revenue-streams.md): 
- Introduction [Environments](https://docs.zen.com/payments/checkout-integration/environments.md): 
- Introduction [Authorization & authentication](https://docs.zen.com/payments/checkout-integration/authorization-authentication.md): 
- Introduction [Payment methods](https://docs.zen.com/payments/checkout-integration/payment-methods.md): 
- Introduction [Payment process](https://docs.zen.com/payments/checkout-integration/payment-process.md): 
- Introduction [Currencies](https://docs.zen.com/payments/checkout-integration/currencies.md): 
- Introduction [Languages](https://docs.zen.com/payments/checkout-integration/languages.md): 
- Account registration & configuration [Before you begin](https://docs.zen.com/payments/checkout-integration/before-begin.md): 
- Account registration & configuration [Registration](https://docs.zen.com/payments/checkout-integration/registration.md): 
- Account registration & configuration [Configuration](https://docs.zen.com/payments/checkout-integration/configuration.md): 
- Account registration & configuration [Merchant’s panel](https://docs.zen.com/payments/checkout-integration/merchant-panel.md): 
- Account registration & configuration [Payments setup](https://docs.zen.com/payments/checkout-integration/payments-setup.md): 
- Account registration & configuration [Locating Transactions in my.zen.com](https://docs.zen.com/payments/checkout-integration/locating-transactions.md): 
- Account registration & configuration [Finding settlements](https://docs.zen.com/payments/checkout-integration/finding-settlements.md): 
- Features [Available features](https://docs.zen.com/payments/checkout-integration/features.md): 
- Features [3-Domain Secure (3DS)](https://docs.zen.com/payments/checkout-integration/3ds.md): 
- Features [Account Funding Transactions (AFT)](https://docs.zen.com/payments/checkout-integration/aft.md): 
- Features [Authorization fee](https://docs.zen.com/payments/checkout-integration/authorization-fee.md): 
- Features [Card widget](https://docs.zen.com/payments/checkout-integration/card-widget.md): 
- Features [Cashback](https://docs.zen.com/payments/checkout-integration/cashback.md): 
- Features [Currency Conversion Service](https://docs.zen.com/payments/checkout-integration/currency-conversion.md): 
- Features [Instant Payment Notification (IPN)](https://docs.zen.com/payments/checkout-integration/ipn.md): 
- Features [Shop logo on ZEN.COM checkout](https://docs.zen.com/payments/checkout-integration/shop-logo.md): 
- Integration [Before you begin](https://docs.zen.com/payments/checkout-integration/integration.md): 
- Integration [Integration checklist](https://docs.zen.com/payments/checkout-integration/checklist.md): 
- Integration [Communication parameters](https://docs.zen.com/payments/checkout-integration/communication-parameters.md): 
- Integration [Prepare the communication](https://docs.zen.com/payments/checkout-integration/communication-preparing.md): 
- Integration [Generating a Signature](https://docs.zen.com/payments/checkout-integration/signature.md): 
- Integration [Purchase Transaction](https://docs.zen.com/payments/checkout-integration/purchase.md): 
- Integration [Purchase Transaction with limited Payment methods](https://docs.zen.com/payments/checkout-integration/purchase-limited.md): 
- Integration [Refund Transaction](https://docs.zen.com/payments/checkout-integration/refund.md): 
- Integration [Transaction statuses](https://docs.zen.com/payments/checkout-integration/statuses.md): 
- Integration > Recurring Payments [About recurring](https://docs.zen.com/payments/checkout-integration/about-recurring.md): 
- Integration > Recurring Payments [Purchase Transaction](https://docs.zen.com/payments/checkout-integration/recurring-transaction.md):