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author: akumaigorodski discussion: https://t.me/lnurl/12568
LNURL-withdraw may contain a payLink in its JSON response. This is done to recognize a fact that SERVICE may want to allow both deposits and withdrawals to user account and as such make a static payment link easily discoverable from withdraw link. When WALLET sees this it may store and show a compound item to user which would allow to both deposit and withdraw (and also to show an up-to-date SERVICE balance if LNURL-withdraw contains a balanceCheck field). Modification required in SERVICE callback JSON of LNURL-withdraw: 
 {
   "tag": "withdrawRequest",
   "callback": string,
   "k1": string,
   "defaultDescription": string,
   "minWithdrawable": number,
   "maxWithdrawable": number,
   "balanceCheck": string,
+  "payLink": string
 }
payLink is raw URL (not bech32-encoded) as described in LUD-17.