[Feature] Add custodial mode

Currently, the instance admin is the only one able to use Lightning, as the private keys are necessary to accept payment, and it is impossible to do the xpub style of “the server just generates addresses” for non-custodial usage.

Proposal: Add a custodial mode where separate stores and users can be created from the instance admin's lightning and the instance admin's xpubs.

This will require a few extra changes to such accounts.

A custodial account must also store:

1. A history of amounts paid and unpaid that the store admin can view but not change or delete.
2. Each payment entry should have a state of “reimbursed/not reimbursed” (it will be changed to reimbursed once the custodian has paid out in fiat or crypto (whatever is agreed upon).
3. Each store of a custodial account should have an option to select which currencies to be reimbursed in, and by what percentage. (including fiat and crypto)
4. The admin account should have a setting for which currencies that they can reimburse with… only currencies explicitly selected in this setting can be chosen by the custodial account.

Also needs solving:

1. What APIs should an exchange / processor provide to btcpayserver?
2. What APIs should the btcpayserver provide to the exchange / processor?

[dennisreimann]

@brainharrington I’m currently making good progress on that front. Hope we can release a v0.1 soonish 😃

[Kukks]

From btcpay point of view, it is harder and we don’t want to couple btcpay to lnbits explicitly. Having it as a lightning node simplifies work considerably.

On Fri, 7 Aug 2020, 14:47 losnappas, [e-mail] wrote:

Right, in that case. But should that be the case? Isn’t it better to treat lnbits as lnbits? Much easier that way, less complicated.

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