contracts/Bank.sol

@@ -1,85 +0,0 @@
-// SPDX-License-Identifier: MIT
-pragma solidity >=0.4.22 <0.9.0;
-import "@openzeppelin/contracts/utils/Counters.sol";
-import "./SoulboundToken.sol";
-
-contract Bank {
-    using Counters for Counters.Counter;
-    Counters.Counter private id_counter;
-
-	struct Order {
-		bool isFinished;
-		uint amount;
-	}
-
-	SoulboundToken sbt;
-	address owner;
-	mapping(address => uint) arrears;
-	mapping(uint => Order) order_amount;
-	mapping(address => uint[]) client_orders;
-	mapping(address => uint) credits;
-	mapping(address => uint) sbt_number;
-
-	constructor(address SBT_addr) {
-		sbt = SoulboundToken(SBT_addr);
-		owner = msg.sender;
-	}
-
-	receive() external payable {}
-
-    modifier onlyBank {
-        require(msg.sender == owner, "Only the owner can access this function.");
-        _;
-    }
-
-	modifier onlyClient {
-		require(sbt_number[msg.sender] != 0);
-		_;
-	}
-
-	function setCredit(address client, uint amount) public onlyBank {
-		credits[client] = amount;
-	}
-
-	function register(uint number) public {
-		uint target = sbt.getAccountNumber(msg.sender);
-		require(target != 0, "You don't have SBT.");
-		require(target == number, "This is not your SBT number.");
-		sbt_number[msg.sender] = target;
-	}
-
-	function pay(address shop, uint amount) public onlyClient {
-		require(amount <= credits[msg.sender], "You don't have enough credit.");
-		id_counter.increment();
-		uint id = id_counter.current();
-		arrears[msg.sender] += amount;
-		order_amount[id] = Order(false, amount);
-		client_orders[msg.sender].push(id);
-		payable(shop).transfer(amount);
-		sbt.logBorrowing(msg.sender, id, amount);
-	}
-
-	function repay() public payable onlyClient returns (uint[] memory, uint) {
-		uint value = msg.value;
-		uint repay_amount = 0;
-		uint should_pay;
-		uint[] memory unfinished = new uint[](client_orders[msg.sender].length);
-		uint refund;
-		uint item_counter = 0;
-		for (uint i=0; i<client_orders[msg.sender].length; i++) {
-			should_pay = order_amount[client_orders[msg.sender][i]].amount;
-			if ((value - repay_amount) >= should_pay){
-				repay_amount += should_pay;
-				order_amount[client_orders[msg.sender][i]].isFinished = true;
-			} else {
-				unfinished[item_counter] = (client_orders[msg.sender][i]);
-				item_counter += 1;
-			}
-		}
-		refund = value - repay_amount;
-		if (refund != 0){
-			payable(msg.sender).transfer(refund);
-		}
-		return (unfinished, refund);
-	}
-}

contracts/SoulboundToken.sol

@@ -17,10 +17,9 @@ contract SoulboundToken is ERC721, Ownable {
 
     mapping(address => bool) private isReliableBank;
     mapping(address => Certificate[]) private certificates;
-    mapping(address => uint) private address_to_number;
 
     event Borrow(address client, address bank, uint id, uint amount);
-    event Repay(address client, address bank, uint id, uint amount);
+    event Repay(address client, address bank, uint id, uint amount, bool finish);
     event Warning(address client, address bank);
 
     constructor() ERC721("Credit System Soulbound Token", "CS_SBT") {}
@@ -29,7 +28,6 @@ contract SoulboundToken is ERC721, Ownable {
         _tokenIds.increment();
         uint256 newItemId = _tokenIds.current();
         _mint(player, newItemId);
-        address_to_number[player] = newItemId;
 
         return newItemId;
     }
@@ -90,8 +88,8 @@ contract SoulboundToken is ERC721, Ownable {
         emit Borrow(client, msg.sender, id, amount);
     }
 
-    function logRepaying(address client, uint id, uint amount) public onlyBank {
+    function logRepaying(address client, uint id, uint amount, bool finish) public onlyBank {
-        emit Repay(client, msg.sender, id, amount);
+        emit Repay(client, msg.sender, id, amount, finish);
     }
 
     function logWarning(address client) public onlyBank {
@@ -105,8 +103,4 @@ contract SoulboundToken is ERC721, Ownable {
     function listCertificate(address client) public view onlyBank returns (Certificate[] memory){
         return certificates[client];
     }
-
-    function getAccountNumber(address client) public view onlyBank returns (uint) {
-        return address_to_number[client];
-    }
 }

migrations/1685866933_migrate_credit_system.js

@@ -1,11 +1,6 @@
-var SBT = artifacts.require("SoulboundToken");
+var MyNFT = artifacts.require("SoulboundToken");
-var Bank = artifacts.require("Bank");
 
 module.exports = function(_deployer) {
 	// Use deployer to state migration tasks.
-	_deployer.deploy(SBT).then((SBT_instance) => {
+	_deployer.deploy(MyNFT, );
-		return _deployer.deploy(Bank, SBT_instance.address).then((Bank_instance) => {
-			return SBT_instance.addReliableBank(Bank_instance.address);
-		});
-	});
 };