Let user know if they won't be able to receive payments through their Lightning Address

[erdemyerebasmaz]

Do not show LN Address QR to the user if

• minSendable is less than 1 sats, or greater than maxSendable
• If maxSendable is smaller than minSendable due to low fee limit, tell user to increase their fee limit

[ok300]

Are these checks not already done in the SDK?

[erdemyerebasmaz]

Are these checks not already done in the SDK?

@ok300 No, not at this stage.

The lightning address is created through our LNURL server and it only returns callbackURL. Validation happens on client side.

For proportional fee of 0.4% & minimum channel setup fee from the connected LSP as 3000 sats;
Let's assume user has set their automatic channel setup fee limit to 1 sats and they have no inbound liquidity, their maxSendable would be 250 sats, which would fall below minSendable. In this case, the QR code should be hidden and user has to be informed to increase their automatic channel setup fee limit

If minSendable is less than 1 or larger than maxSendable for any other reason- e.g.; minimum channel setup fee from the connected LSP is either set to 0 or is more than maxSendable- than the QR should be hidden as the user won't be able to receive any payments.

[ok300]

I see, makes sense. Thanks.

[erdemyerebasmaz]

Decided not to hide ln address as they are reusable. We'll convey the user they won't be able to receive payments at the time and as to reasons* why on the UI.

*: high LSP fees, low channel setup fee limit setting etc.

[erdemyerebasmaz]

Closing in favor of #876