Actually is not ready yet for the public(For security reason) and it's still under development but I have a testing site if you want to check you can find it here




It is likely the same as BTCpay they are both providing payment gateway. The only difference between them Coinremitter holds the private key(or store on their database) and the transaction fee is not the same as BTCpay that offers 0% transaction fees.

Unlike BTCpay they let users create their own wallet and add their own "xPUB" Master public key generated from the user's wallet. So the private keys are not stored on BTCpay.

If your plan is to develop a payment gateway the same as Coinmitter and earn from transaction fees then BTCpay is not the right option  but since you are a developer you can modify their opensource code from here https://github.com/btcpayserver/btcpayserver

However, if your plan is to provide a payment gateway without transaction fees BTCpay is the right choice. You just need to modify the design of the front page to make the page unique just like the other 3rd party hosting do.



For learning, you can find many programming guides related to Bitcoin blockchain from here
- https://github.com/openblockchains/awesome-blockchains
- https://github.com/jashmenn/bitcoin-reading-list

I assume that by "payment processor" you mean software that will generate addresses that can receive bitcoins and verify that the bitcoins have been received.

You don't need to create transactions in order to receive bitcoins, but you do need a node in order to monitor the block chain so that you can verify that the bitcoins have been received.

DNS seeds are used to find other nodes. You need other nodes in order to receive transactions and blocks so that you can verify payments.

Mastering Bitcoin by Andreas M. Antonopoulos is a good source for basic information. You can also view the source of projects on Github such as bcoin, bitcoin, and libbitcoin


You must not store private keys. You will get hacked and lose bitcoins. Instead, a user provides you with an extended public key that you use to generate addresses for the user.

Yes, I'm using this for many months on my Woocommerce  Wordpress website using their plugin.
Tested it on testnet and on-chain it's working fine to me without any issue yet.

You'll need a database to keep track of the user's addresses and the Bitcoins in each of the addresses. Ensuring the security and managing the Bitcoins for users is no easy feat and it generally isn't recommended for anyone to develop wallets from scratch.
To craft a transaction, you don't need a full node or any client for that matter. All you need is to write a code which manages the scripts and signs the transaction using the private key. It isn't very hard and there are quite a few libraries[1] that you can use.
DNS seeds fetches the IP addresses of a few nodes that are always online on the Bitcoin network. The seeds are not nodes by themselves and you cannot request any usable information about Bitcoin blockchain from there. You can only query and send information over to the Bitcoin node but you can't connect to them to create transactions.

I won't recommend you to only retrieve information without further verification. Operating a payment server without operating a full node is dangerous given the attack vectors.
[1] https://github.com/1200wd/bitcoinlib

I don't know how DNS seed works but for me, there is an easy way to implement a payment processor on your website that doesn't need to download the whole blockchain just to have a full node.

I suggest you check their documentation from here https://docs.btcpayserver.org/getting-started/
It is easy to implement than developing your own payment processor that requires a full node. BTCpayserver only needs your wallet "xpubkey" or Master public key on Electrum. You can also use your own full node/Electrum personal server if you want but if you don't want to download the whole blockchain you can use any server from Electrum.

Opensource: https://github.com/btcpayserver/btcpayserver

Also, check this page below if you want to host and deploy this in your own hardware/VPS/Raspi.
- https://docs.btcpayserver.org/deployment/deployment
It requires a full node(Must be fully synced)

Another source that includes video guides:
- How to deploy BTCPay Server on a VPS (Docker )
- Launch BTCPay Server via web-interface and deploy Full Bitcoin Node + LND
- Setting up BTCPay Server development environment on Linux (Ubuntu)
- Connecting your Wallet to BTCPay Server with xpub Ledger Nano S or other like Electrum
- BTCPay Deployment - One Click Setup via Azure

Other payment processors(Self-hosted and Hosted payment processors)
- https://github.com/alexk111/awesome-bitcoin-payment-processors