get the vouchers list and store in gdbm

internal/models/vouchersresponse.go

@@ -1,7 +1,15 @@
 package models
 
-// VoucherHolding represents a single voucher holding
-type VoucherHolding struct {
-	Symbol  string `json:"symbol"`
-	Address string `json:"address"`
-}
+// VoucherHoldingResponse represents a single voucher holding
+type VoucherHoldingResponse struct {
+	Ok          bool   `json:"ok"`
+	Description string `json:"description"`
+	Result      struct {
+		Holdings []struct {
+			ContractAddress string `json:"contractAddress"`
+			TokenSymbol     string `json:"tokenSymbol"`
+			TokenDecimals   string `json:"tokenDecimals"`
+			Balance         string `json:"balance"`
+		} `json:"holdings"`
+	} `json:"result"`
+}