add convertible max/min sendable fields

21.md

@@ -41,7 +41,10 @@ type Currency = {
   symbol: string, // Symbol of the currency. E.g.: R$
   decimals: number, // Integer; Number of decimal places. E.g.: 2
   multiplier: number, // Double; Number of millisatoshis per smallest unit of currency. E.g.: 5405.405
-  convertible?: bool // Whether the payment can be converted into the currency
+  convertible?: { // Whether the payment can be converted into the currency
+    max: number, // Integer; Max converted amount of currency
+    min: number // Integer; Min converted amount of currency
+  }
 }
 
 type ExtendedResponse = BaseResponse & {
@@ -63,19 +66,23 @@ type ExtendedResponse = BaseResponse & {
 +     "symbol": "R$",
 +     "decimals": 2,
 +     "multiplier": 5404.405,
-+     "convertible": true
++     "convertible": {
++       "max": 100000,
++       "min": 1000
++     }
 +   }
 + ]
 }
 ```
 
 - The inclusion of the `currencies` field implies the support of this extension
 - The inclusion of a `currency` implies it can be used for denomination of an amount
-- The inclusion of a `convertible currency` implies the `SERVICE` can quote and guarantee a price for a given currency
+- The inclusion of a `convertible` field implies the `SERVICE` can quote and guarantee a price for a given `currency`
 - The `multiplier` is not guaranteed by the `SERVICE` and is subject to change
 - The `code` of a `currency` will be used as an identifier for the next request and must be unique
 - The `code` must be according to [ISO-4217](https://en.wikipedia.org/wiki/ISO_4217) if possible
 - The order of the `currencies` may be interpreted by the `WALLET` as the receiving user preference for a currency
+- The `max` and `min` fields within `convertible` field must be respected by `WALLET` on `convertable` requests
 
 ### Wallet-side second request
 
@@ -140,7 +147,10 @@ These examples show all the possible uses of this extension by a supporting `WAL
       "symbol": "R$",
       "decimals": 2,
       "multiplier": 5405.405,
-      "convertible": true
+      "convertible": {
+        "max": 100000,
+        "min": 100
+      }
     },
     {
       "code": "USDT",