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WebUPI is designed to allow web applications to interact seamlessly with UPI enabled applications. This guide is intended to help implement the WebUPI API with Lightning network.

Let's talk about a new method for the WebUPI API: webUPI.sendPaymentToLightning().

This function would take a BOLT-11 invoice and a callback URL as input. The BOLT-11 invoice would be provided by the merchant and represent the amount of BTC lightning that the merchant wishes to receive. The callback URL would be used by the UPI app or the cryptocurrency exchange to send a notification when the payment has been processed.

This is just a proposed definition and usage. The actual implementation would depend on the specific UPI app, the cryptocurrency exchange, and the payment gateway used.

Please note that this would require the UPI app and the cryptocurrency exchange to support this functionality, which might not be the case currently. It would also require a secure and reliable way of handling the conversion and transfer of funds. Additionally, there would be a number of regulatory considerations to take into account, especially around anti-money laundering (AML) and know your customer (KYC) requirements.

The implementation of this function would involve a number of steps:

1. The web application calls webUPI.sendPaymentToLightning() with the BOLT-11 invoice and the callback URL.

2. The UPI app initiates a UPI payment to the cryptocurrency exchange, including the BOLT-11 invoice and the callback URL in the payment details.

3. The cryptocurrency exchange receives the UPI payment, converts the INR to BTC lightning, and sends the BTC lightning to the address specified in the BOLT-11 invoice.

4. The cryptocurrency exchange sends a notification to the callback URL to inform the web application that the payment has been processed.

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