Add asset close to amount field to transaction

daemon/algod/api/algod.oas2.json

@@ -2148,6 +2148,10 @@
             "description": "Closing amount for the transaction.",
             "type": "integer"
           },
+          "asset-closing-amount": {
+            "description": "The number of the asset's unit that were transferred to the close-to address.",
+            "type": "integer"
+          },
           "confirmed-round": {
             "description": "The round where this transaction was confirmed, if present.",
             "type": "integer"

daemon/algod/api/algod.oas3.yml

@@ -463,6 +463,10 @@
                   "description": "The application index if the transaction was found and it created an application.",
                   "type": "integer"
                 },
+                "asset-closing-amount": {
+                  "description": "The number of the asset's unit that were transferred to the close-to address.",
+                  "type": "integer"
+                },
                 "asset-index": {
                   "description": "The asset index if the transaction was found and it created an asset.",
                   "type": "integer"
@@ -3129,6 +3133,10 @@
                       "description": "The application index if the transaction was found and it created an application.",
                       "type": "integer"
                     },
+                    "asset-closing-amount": {
+                      "description": "The number of the asset's unit that were transferred to the close-to address.",
+                      "type": "integer"
+                    },
                     "asset-index": {
                       "description": "The asset index if the transaction was found and it created an asset.",
                       "type": "integer"
@@ -3189,6 +3197,10 @@
                       "description": "The application index if the transaction was found and it created an application.",
                       "type": "integer"
                     },
+                    "asset-closing-amount": {
+                      "description": "The number of the asset's unit that were transferred to the close-to address.",
+                      "type": "integer"
+                    },
                     "asset-index": {
                       "description": "The asset index if the transaction was found and it created an asset.",
                       "type": "integer"

daemon/algod/api/server/v1/handlers/handlers.go

@@ -315,6 +315,10 @@ func assetTransferTxEncode(tx transactions.Transaction, ad transactions.ApplyDat
 		xfer.CloseTo = tx.AssetTransferTxnFields.AssetCloseTo.String()
 	}
 
+	if ad.AssetClosingAmount != 0 {
+		xfer.CloseToAmount = ad.AssetClosingAmount
+	}
+
 	return v1.Transaction{
 		AssetTransfer: &xfer,
 	}