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+WIP: LUD-24: LNURL chain.
+=====================================================
+
+`author: arcbtc`
+
+---
+
+Extends LUD-19, so ANY LNURL can be returned in the JSON response as an `action`. Upon success, if the `action` exists it will be automatically used. 
+
+```diff
+ {
+   "tag": "withdrawRequest",
+   "callback": string,
+   "k1": string,
+   "defaultDescription": string,
+   "minWithdrawable": number,
+   "maxWithdrawable": number,
+   "balanceCheck": string,
++  "action": <string LNURL>
+ }
+```