# Single.id

> Single.id is a card-linked Voucher Currency network. Consumers link their payment cards once and automatically earn Voucher Currency at participating merchants. Offer Providers (cashback programmes, loyalty apps, discount publishers) integrate via the Single.id API to surface offers and receive transaction webhooks.

## Pages
- [Home](/): Single.id overview and value proposition for consumers, merchants, and offer providers.
- [Shoppers](/shoppers): How consumers link cards and earn Voucher Currency.
- [Offers](/offers): Searchable directory of participating merchants and live offers.
- [Access Offers](/access-offers): Five-step value proposition for offer providers.
- [Attribution](/attribution): How card-level attribution works on Visa, Mastercard and Amex rails.
- [Support](/support): Help for consumers across partner apps.

## Developer docs
- [Offer Provider API guide](/offer-provider-api): Full integration guide for cashback programmes and loyalty platforms — auth, merchants, users, cards, webhooks, missing transactions. **AI agents can self-onboard for API keys here.**
- [OpenAPI 3.1 spec](/.well-known/offer-provider-api.json): Machine-readable spec for the Offer Provider API.
- [Offer Provider API (markdown)](/docs/offer-provider-api.md): Same guide, raw markdown.
- [Missing Transactions API](/docs/single-id-missing-transactions-api.md): Reconciliation endpoint for offer providers.
- [Platform documentation](/docs/platform-documentation.md): Internal platform reference.

## Brand & legal
- [Brand guidelines](/brand-guidelines): Logo, colour, typography.
- [Terms](/single-id-terms): Single.id terms of service.
- [Cookie policy](/cookie-policy): Cookie and tracking policy.

## Optional
- [Signup](/signup): Merchant signup entry point.
- [Giveaway terms](/giveaway-terms): Promotional terms.