GRSPay

GRSPay is a free and open-source cryptocurrency payment processor which allows you to receive payments in Groestlcoin with no fees, transaction cost or a middleman.

GRSPay is a non-custodial invoicing system which eliminates the involvement of a third-party. Payments with GRSPay go directly to your wallet, which increases the privacy and security. Your private keys are never uploaded to the server. There is no address re-use, since each invoice generates a new address deriving from your xpubkey or zpubkey.

GRSPay is available at https://grspay.com

Tutorials:

Changelog v1.0.5.5
• Payjoin support for stores (Receiving)
• Payjoin support in the internal wallet (Sending)
• Coin Selection feature in the internal wallet
• New invoice default theme
• New invoice dark theme
• New site default theme
• New site dark theme
• Camera QR Code scanner for Wallet
• Add Notifications feature
• Add Pull Payments feature
• Add Refund feature

Features
• Direct, P2P Groestlcoin payments
• Lightning Network support
• Complete control over private keys
• Enchanced privacy
• SegWit support
• Process payments for others
• Payment buttons
• Point of sale
• No transaction fees (other than those for the crypto networks)
• No processing fees
• No middleman
• No KYC
• The software is built in C#
• You can run GRSPay as a self-hosted solution on your own server or use a our host. The self-hosted solution allows you not only to attach an unlimited number of stores but also become the payment processor for others.
• Open Source - MIT license

This application is licensed under MIT. There is no warranty and no party shall be made liable to you for damages. If you lose coins due to this app, no compensation will be given. Use this app solely at your own risk.

Source code:
https://github.com/Groestlcoin/btcpayserver - GRSPay code