capsul-flask/docs/btcpay.md

Setting up the BTCPAY_PRIVATE_KEY

Generate a private key and the accompanying bitpay SIN for the btcpay API client.

I used this code as an example: https://github.com/bitpay/bitpay-python/blob/master/bitpay/key_utils.py#L6

$ pipenv run python ./readme/generate_btcpay_keys.py

It should output something looking like this:

-----BEGIN EC PRIVATE KEY-----
EXAMPLEIArx/EXAMPLEKH23EXAMPLEsYXEXAMPLE5qdEXAMPLEcFHoAcEXAMPLEK
oUQDQgAEnWs47PT8+ihhzyvXX6/yYMAWWODluRTR2Ix6ZY7Z+MV7v0W1maJzqeqq
NQ+cpBvPDbyrDk9+Uf/sEaRCma094g==
-----END EC PRIVATE KEY-----


EXAMPLEwzAEXAMPLEEXAMPLEURD7EXAMPLE

In order to register the key with the btcpay server, you have to first generate a pairing token using the btcpay server interface. This requires your btcpay server account to have access to the capsul store. Ask Cass about this.

Navigate to Manage store: Access Tokens at: https://btcpay.cyberia.club/stores/<store-id>/Tokens

Finally, send an http request to the btcpay server to complete the pairing:

curl -H "Content-Type: application/json" https://btcpay.cyberia.club/tokens -d "{'id': 'EXAMPLEwzAEXAMPLEEXAMPLEURD7EXAMPLE', 'pairingCode': 'XXXXXXX'}"

It should respond with a token:

{"data":[{"policies":[],"pairingCode":"XXXXXXX","pairingExpiration":1589473817597,"dateCreated":1589472917597,"facade":"merchant","token":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx","label":"capsulflask"}]}

And you should see the token in the btcpay server UI:

Now simply set your BTCPAY_PRIVATE_KEY variable in .env

NOTE: make sure to use single quotes and replace the new lines with \n.

BTCPAY_PRIVATE_KEY='-----BEGIN EC PRIVATE KEY-----\nEXAMPLEIArx/EXAMPLEKH23EXAMPLEsYXEXAMPLE5qdEXAMPLEcFHoAcEXAMPLEK\noUQDQgAEnWs47PT8+ihhzyvXX6/yYMAWWODluRTR2Ix6ZY7Z+MV7v0W1maJzqeqq\nNQ+cpBvPDbyrDk9+Uf/sEaRCma094g==\n-----END EC PRIVATE KEY-----'

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testing cryptocurrency payments

I used litecoin to test cryptocurrency payments, because its the simplest & lowest fee cryptocurrency that BTCPay server supports. You can download the easy-to-use litecoin SPV wallet electrum-ltc from github.com/pooler/electrum-ltc or electrum-ltc.org, set up a wallet, and then either purchase some litecoin from an exchange, or ask Forest for some litecoin to use for testing.

sequence diagram explaining how BTC payment process works (how we accept 0-confirmation transactions 😀)

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