Add type currency for offers amount field. Eg.1.50USD.

contrib/msggen/msggen/schema.json

@@ -15676,10 +15676,20 @@
   },
   "stop.schema.json": {
     "$schema": "http://json-schema.org/draft-07/schema#",
-    "type": "string",
-    "enum": [
-      "Shutdown complete"
-    ]
+    "type": "object",
+    "additionalProperties": false,
+    "required": [
+      "result"
+    ],
+    "properties": {
+      "result": {
+        "type": "string",
+        "added": "v24.05",
+        "enum": [
+          "Shutdown complete"
+        ]
+      }
+    }
   },
   "txdiscard.request.json": {
     "$schema": "http://json-schema.org/draft-07/schema#",

contrib/pyln-testing/pyln/testing/fixtures.py

@@ -392,6 +392,13 @@ def _extra_validator(is_request: bool):
             return True
         return is_msat_request(checker, instance)
 
+    def is_currency(checker, instance):
+        """currency including currency code"""
+        pattern = re.compile(r'^\d+(\.\d+)?[A-Z][A-Z][A-Z]$')
+        if pattern.match(instance):
+            return True
+        return False
+
     # "msat" for request can be many forms
     if is_request:
         is_msat = is_msat_request
@@ -410,6 +417,7 @@ def _extra_validator(is_request: bool):
         "msat": is_msat,
         "msat_or_all": is_msat_or_all,
         "msat_or_any": is_msat_or_any,
+        "currency": is_currency,
         "txid": is_txid,
         "signature": is_signature,
         "bip340sig": is_bip340sig,