---
page_title: Additional S2S APIs
product: Payv3
platform: Web
page_source: https://juspay.io/in/docs/payv3/web/base-integration/other-server-apis
llms_txt: https://juspay.io/in/docs/llms.txt
product_llms_txt: https://juspay.io/in/docs/payv3/llms.txt
---


## Additional Server APIs



 Merchant will have to initiate server-to-server calls for the below use cases:

* **Handling Callback responses from Juspay Server (webhooks)** [Click for Documentation](https://docs.juspay.in/payv3/web/base-integration/webhooks)
* **Mandates S2S APIs** [Click for Documentation](https://docs.juspay.in/api-reference/docs/express-checkout/mandate-flow)

---

## See Also

- [Webhooks](https://juspay.io/in/docs/payv3/web/base-integration/webhooks)
- [1. Implementing Checkout](https://juspay.io/in/docs/payv3/web/base-integration/getting-payv3)