use ERC20 datatype

contracts/core/DataTypes.sol

@@ -31,7 +31,7 @@ library DataTypes {
         uint256 expirationBlock;
         bytes32 pixTarget;
         uint80 amount;
-        address token;
+        ERC20 token;
         address buyerAddress;
         address seller;
     }

contracts/core/EventAndErrors.sol

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.19;
 
+import { ERC20 } from "../lib/tokens/ERC20.sol";
+
 // prettier-ignore
 interface EventAndErrors {
     /// ███ Events ████████████████████████████████████████████████████████████
@@ -9,19 +11,19 @@ interface EventAndErrors {
     event DepositAdded(
         address indexed seller,
         // uint256 depositID,
-        address token,
+        ERC20 token,
         uint256 amount
     );
     /// @dev 0xca585721b6b442dc9183932f7c84dc2880efb67c4da52cc06873e78971105d49
     event ValidSet(
         address indexed seller,
-        address token,
+        ERC20 token,
         bool state
     );
     /// @dev 0x2cd6435b1b961c13f55202979edd0765a809f69a539d8a477436c94c1211e43e
     event DepositWithdrawn(
         address indexed seller,
-        address token,
+        ERC20 token,
         uint256 amount
     );
     /// @dev 0x8fb3989f70bd172a37d15b41b015e48ea09d59329638377304a4198cd0c4ea65

contracts/core/OwnerSettings.sol

@@ -31,7 +31,7 @@ abstract contract OwnerSettings is
         uint256 defaultBlocks,
         address[] memory validSigners,
         address _reputation,
-        address[] memory tokens,
+        ERC20[] memory tokens,
         bool[] memory tokenStates
     ) {
         setDefaultLockBlocks(defaultBlocks);
@@ -133,7 +133,7 @@ abstract contract OwnerSettings is
     }
 
     function tokenSettings(
-        address[] memory _tokens,
+        ERC20[] memory _tokens,
         bool[] memory _states
     ) public onlyOwner {
         /* Yul Impl */

contracts/p2pix.sol

@@ -39,7 +39,7 @@ contract P2PIX is BaseUtils {
         uint256 defaultBlocks,
         address[] memory validSigners,
         address _reputation,
-        address[] memory tokens,
+        ERC20[] memory tokens,
         bool[] memory tokenStates
     ) 
         OwnerSettings(
@@ -98,7 +98,7 @@ contract P2PIX is BaseUtils {
 
         clearReentrancyGuard();
 
-        emit DepositAdded(msg.sender, address(args.token), args.amount);
+        emit DepositAdded(msg.sender, args.token, args.amount);
     }
 
     /// @notice Enables seller to invalidate future
@@ -117,7 +117,7 @@ contract P2PIX is BaseUtils {
 
             _setValidState(msg.sender, token, _sellerBalance);
 
-            emit ValidSet(msg.sender, address(token), state);
+            emit ValidSet(msg.sender, token, state);
         } else revert NotInitialized();
     }
 
@@ -160,38 +160,34 @@ contract P2PIX is BaseUtils {
         (sender, forwarder) = _isTrustedForwarder();
         bytes32 _pixTarget = getPixTarget(args.seller, args.token);
 
+        // transaction forwarding must leave `merkleProof` empty;
+        // otherwise, the trustedForwarder must be previously added 
+        // to a seller whitelist.
+        if (args.merkleProof.length != 0) {
+            _merkleVerify( args.merkleProof, sellerAllowList(args.seller), sender);
+
+        } else if (args.amount > REPUTATION_LOWERBOUND && forwarder == 0) {
+            
+            uint256 spendLimit; uint256 userCredit = 
+            userRecord[_castAddrToKey(msg.sender)];
+            (spendLimit) = _limiter(userCredit / WAD);
+            if ( 
+                args.amount > (spendLimit * WAD) || 
+                args.amount > LOCKAMOUNT_UPPERBOUND 
+            ) revert AmountNotAllowed();
+        }
+
         DT.Lock memory l = DT.Lock(
             c,
             (block.number + defaultLockBlocks),
             _pixTarget,
             args.amount,
-            address(args.token),
+            args.token,
             sender,
             args.seller
         );
 
-        if (args.merkleProof.length != 0) {
-            _merkleVerify(args.merkleProof, sellerAllowList(args.seller), sender);
         lockID = _addLock(bal, l);
-
-        } else {
-            if (l.amount <= REPUTATION_LOWERBOUND) {
-            lockID = _addLock(bal, l);
-
-        } else {
-            if (forwarder != 0) {
-                lockID = _addLock(bal, l);
-        } else {
-            uint256 spendLimit; uint256 userCredit = 
-            userRecord[_castAddrToKey(msg.sender)];
-            (spendLimit) = _limiter(userCredit / WAD);
-            if ( 
-                l.amount > (spendLimit * WAD) || 
-                l.amount > LOCKAMOUNT_UPPERBOUND 
-            ) revert AmountNotAllowed();
-            lockID = _addLock(bal, l);
-
-        /*  */}/*  */}/*  */}
     }
 
     /// @notice Lock release method that liquidate lock
@@ -272,12 +268,12 @@ contract P2PIX is BaseUtils {
             _notExpired(l);
 
             uint256 _sellerBalance = 
-            __sellerBalance(l.seller, ERC20(l.token)) & BITMASK_SB_ENTRY;
+            __sellerBalance(l.seller, l.token) & BITMASK_SB_ENTRY;
 
             if ((_sellerBalance + l.amount) > MAXBALANCE_UPPERBOUND)
                 revert MaxBalExceeded();
 
-            _addSellerBalance(l.seller, ERC20(l.token), l.amount);
+            _addSellerBalance(l.seller, l.token, l.amount);
 
             l.amount = 0;
 
@@ -338,7 +334,7 @@ contract P2PIX is BaseUtils {
 
         emit DepositWithdrawn(
             msg.sender,
-            address(token),
+            token,
             amount
         );
     }

src/types/factories/core/BaseUtils__factory.ts

@@ -142,7 +142,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -167,7 +167,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -369,7 +369,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -622,7 +622,7 @@ const _abi = [
   {
     inputs: [
       {
-        internalType: "address[]",
+        internalType: "contract ERC20[]",
         name: "_tokens",
         type: "address[]",
       },

src/types/factories/core/EventAndErrors__factory.ts

@@ -135,7 +135,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -160,7 +160,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -343,7 +343,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },

src/types/factories/core/OwnerSettings__factory.ts

@@ -140,7 +140,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -165,7 +165,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -367,7 +367,7 @@ const _abi = [
       },
       {
         indexed: false,
-        internalType: "address",
+        internalType: "contract ERC20",
         name: "token",
         type: "address",
       },
@@ -563,7 +563,7 @@ const _abi = [
   {
     inputs: [
       {
-        internalType: "address[]",
+        internalType: "contract ERC20[]",
         name: "_tokens",
         type: "address[]",
       },