Have pay just pay a bolt12 offer

[Sjors]

I ran into the same confusion that led to #5473.

lightning-cli pay lno1zrxq... 100sat
{
   "code": -32602,
   "message": "Invalid bolt12: unexpected prefix lno"
}

You have to call fetchinvoice and then pay that.

Why not just do that automatically?

[vincenzopalazzo]

You have to call fetchinvoice and then pay that.

This is true for any bolt12. It is also true that it is trivial to add a pay <bolt12> helper

[Sjors]

I can imagine needing a different flow for bolt12 offers that give away money. And repeating payments also aren't very suitable for the pay call.

[vincenzopalazzo]

I can imagine needing a different flow for bolt12 offers that give away money. And repeating payments also aren't very suitable for the pay call.

You are right, in fact I have a plugin that wrap the bolt12, so it is time to upstream the changes. Thanks for reporting

[rustyrussell]

Currency conversions and repeated payments both need a different flow, so it's generalized. But if the amount is known and it's not repeated (which, TBF, is very common), it's totally possible to have pay Just Work,

[Sjors]

Could currency conversion be handled through a plugin? So you'd simply use pay bolt12_fiat_amount and if the plugin is there, it just works, and otherwise it complains "sorry, no plugin".

[vincenzopalazzo]

Could currency conversion be handled through a plugin? So you'd simply use pay bolt12_fiat_amount and if the plugin is there, it just works, and otherwise it complains "sorry, no plugin".

Yes, but this is another story, the pay plugin should handle bolt12 IMHO, I will try to see what kind of code is required to implement it

[rustyrussell]

I'm moving this to next milestone, sorry. I'd really like xpay to do this at some point though...

[vincenzopalazzo]

I started working on it, but I think it is better wait for a cycle to have the xpay in good shape before adding another pile of code on top of it.