BTCPay is a non-custodial software, which means that all the funds received to your store, will end up directly into your connected wallet.
Note: A private key (xprv) is never required for receiving money on-chain to a BTCPay wallet. The software needs a public key (xpubkey) which is a watch-only wallet token. The xpubkey allows BTCPay to generate a new address each time a new invoice is generated. It enables users to observe the wallet balance and transactions without having to share their private key. Exception is Lightning Network which is a hot wallet with keys online.
To manage the funds received to your BTCPay wallet, you can use an internal BTCPay Wallet or an external wallet. We recommend that you use internal wallet, since it's connected to your full node and does not leak information to third-parties. If you're using an external wallet, we recommend that you use the wallet which:
Allows connection to a full node
Allows custom gap limit
This page lists the recommended wallets for BTCPay Server. Click on the link and you will be redirected to a step by step tutorial on how to set up particular wallet with BTCPay Server.
Proceed to the next step - What's Next?.