# Tendr

> One Checkout - Every way to pay

- [Introduction](https://docs.usetendr.tech/introduction.md): Tendr universal checkout for digital commerce
- [Quickstart](https://docs.usetendr.tech/quickstart.md)
- [Idempotency](https://docs.usetendr.tech/concepts/idempotency.md)
- [Payment links](https://docs.usetendr.tech/payment-links/overview.md): Share a link or a QR code and get paid, with no website or code on your side.
- [Branding your checkout](https://docs.usetendr.tech/themes/overview.md): Make the Tendr checkout and payment link pages look like your store with themes, blocks, fonts, colours and light or dark mode.
- [Theme safety rules](https://docs.usetendr.tech/themes/safety-rules.md): What custom CSS, custom HTML and theme text may and may not contain, every refusal message, and the risks Tendr accepts.
- [API overview](https://docs.usetendr.tech/api-reference/overview.md)
- [Payment links API](https://docs.usetendr.tech/api-reference/payment-links.md): Create, list, read, update and archive payment links, and the two public endpoints the pay page uses.
- [Themes API](https://docs.usetendr.tech/api-reference/themes.md): Create, edit, preview, publish and delete checkout themes, upload their assets, pull a brand, and name a theme on a session.
- [Webhooks](https://docs.usetendr.tech/api-reference/webhooks.md)
- [Gasless payments](https://docs.usetendr.tech/gasless/overview.md): How a shopper pays with a token and no gas coin, who pays the network fee, and where it does not apply.
- [Gas policy and usage](https://docs.usetendr.tech/gasless/gas-policy.md): Set how much gas your store sponsors, read the month's usage, and list sponsored transactions.
- [TypeScript SDK](https://docs.usetendr.tech/sdks/typescript.md)
- [E-commerce](https://docs.usetendr.tech/integrations/ecommerce.md)
- [Integrator hooks](https://docs.usetendr.tech/integrations/hooks.md): Tell your own smart contract that a payment settled, with onTendrDeposit on EVM chains and on_tendr_deposit on NEAR.
- [NEAR Intents](https://docs.usetendr.tech/integrations/near-intents.md)
- [API keys](https://docs.usetendr.tech/security/api-keys.md)
- [Webhook signatures](https://docs.usetendr.tech/security/webhook-signatures.md)
- [Production checklist](https://docs.usetendr.tech/security/production-checklist.md)
- [Local setup](https://docs.usetendr.tech/development/local-setup.md)
- [Troubleshooting](https://docs.usetendr.tech/development/troubleshooting.md)


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