Adapt BIP21 payment requests for Liquid

BIP0021 defines the rules for payment requests, we need something similar for Liquid (or other elements instances), thus we should define:

• the name of the network prefix, for Liquid specifically liquid is proposed as preferred name
• additional parameters
  • assetid, to refer to the user desired asset
  • amount, amounts should probably follow BIP21 guidelines and be specified in the URI as decimal BTC, irrespectively of the issuer defined precision (examples). Though the clients – both when generating and parsing the URI – should keep in consideration the precision specified by the asset issuers, as that is the amount that issuers ultimately inted to be displayed to users.

I wonder if this is compatible with elements-qt, especially the assetid part, as the amount would be treated the same as Bitcoin already does.

Anyone have different ideas/objections to this?

Comienza revisando la especificación BIP21 enlazada y cómo elements-qt gestiona las solicitudes de pago. Resuelve el prefijo propuesto para la red Liquid, el parámetro assetid y el comportamiento de la precisión del importe, incluida la compatibilidad con clientes de Elements. Se considerará terminado cuando la comunidad haya acordado una especificación y el alcance de la implementación.