included link to API-Explorer for PaymentsApp API (#332)

Author: DjoykeAbyah

README.md

@@ -24,7 +24,7 @@ This is the officially supported Python library for using Adyen's APIs.
 | [Transfers API](https://docs.adyen.com/api-explorer/transfers/4/overview)                 | Endpoints for managing transfers, getting information about transactions or moving fund                                                                                                                                                                                                                                                 | transfers             | **v4**            |
 | [Disputes API](https://docs.adyen.com/api-explorer/Disputes/30/overview)                  | You can use the [Disputes API](https://docs.adyen.com/risk-management/disputes-api) to automate the dispute handling process so that you can respond to disputes and chargebacks as soon as they are initiated. The Disputes API lets you retrieve defense reasons, supply and delete defense documents, and accept or defend disputes. | disputes              | **v30**                                                                         |
 | [POS Mobile API](https://docs.adyen.com/api-explorer/possdk/68/overview)                   | The POS Mobile API is used in the mutual authentication flow between an Adyen Android or iOS [POS Mobile SDK](https://docs.adyen.com/point-of-sale/ipp-mobile/) and the Adyen payments platform. The POS Mobile SDK for Android or iOS devices enables businesses to accept in-person payments using a commercial off-the-shelf (COTS) device like a phone. For example, Tap to Pay transactions, or transactions on a mobile device in combination with a card reader. | posMobile          | **v68**              |
-| [Payments App API]() | The Payments App API is used to Board and manage the Adyen Payments App on your Android mobile devices. | paymentsApp | **v1** |
+| [Payments App API](https://docs.adyen.com/api-explorer/payments-app/1/overview) | The Payments App API is used to Board and manage the Adyen Payments App on your Android mobile devices. | paymentsApp | **v1** |
 
 For more information, refer to our [documentation](https://docs.adyen.com/) or the [API Explorer](https://docs.adyen.com/api-explorer/).