> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/click-to-pay/integrate-the-d1-api/d1-api-reference.md).

# D1 API reference

Use these OpenAPI (Swagger) files to implement your backend.

You can also import them into tooling such as Postman or Insomnia.

### Download OpenAPI (Swagger) files

The links below are placeholders.

Update them to your final hosting location.

#### Inbound APIs (Issuer -> Thales D1)

* OAuth2 API: [D1-Public-IN-v1-Auth2](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-IN-v1-Auth2.yaml)​
* Consumer API: [D1-Public-IN-v2-Consumer](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-IN-v2-Consumer.yaml)​
* Card API (v2): [D1-Public-IN-v2-Card](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-IN-v2-Card.yaml)​
* Card API (v1): [D1-Public-IN-v1-Card](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-IN-v1-Card.yaml)
* Click to Pay API: [D1-Public-IN-v1-ClickToPay](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-IN-v1-ClickToPay.yaml)

#### Outbound APIs (Issuer <- Thales D1)

* OAuth2 API: [D1-Public-OUT-v1-Auth2](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-OUT-v1-Auth2.yaml)​
* Consumer API: [D1-Public-OUT-v1-Consumer](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-OUT-v1-Consumer.yaml)​
* Card API: [D1-Public-OUT-v2-Card](https://openapi.gitbook.com/o/fwy1mtbRONGA2YDKDBr0/spec/D1-Public-OUT-v2-Card.yaml)

{% hint style="info" %}
If you publish a single combined OpenAPI file, replace the per-API links with one link.
{% endhint %}

### Browse the API reference

Use these pages to read the request/response details.

#### Inbound APIs (Issuer -> Thales D1)

* [OAuth2 API](/click-to-pay/integrate-the-d1-api/d1-api-reference/inbound-api-to-d1/oauth2-api.md)
* [Consumer API](/click-to-pay/integrate-the-d1-api/d1-api-reference/inbound-api-to-d1/consumer-api.md)
* [Card API](/click-to-pay/integrate-the-d1-api/d1-api-reference/inbound-api-to-d1/card-api.md)
* [Click to Pay API](/click-to-pay/integrate-the-d1-api/d1-api-reference/inbound-api-to-d1/click-to-pay-api.md)

#### Outbound APIs (Issuer <- Thales D1)

* [OAuth2 API](/click-to-pay/integrate-the-d1-api/d1-api-reference/outbound-api-from-d1/oauth2-api.md)
* [Consumer API](/click-to-pay/integrate-the-d1-api/d1-api-reference/outbound-api-from-d1/consumer-api.md)
* [Card API](/click-to-pay/integrate-the-d1-api/d1-api-reference/outbound-api-from-d1/card-api.md)


---

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