Bp 168 platform transfer

contracts/TalentLayerIdUtils.sol

@@ -5,24 +5,27 @@ import {TalentLayerID} from "./TalentLayerID.sol";
 import {IERC721Receiver} from "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
 
 contract TalentLayerIdUtils is IERC721Receiver {
-
     // =========================== Mappings & Variables ==============================
 
     /**
      * @notice Instance of TalentLayerID.sol
      */
     TalentLayerID public talentLayerIdContract;
 
-
     // =========================== Initializers ==============================
 
-    constructor(address _talentLayerIDAddress){
+    constructor(address _talentLayerIDAddress) {
         talentLayerIdContract = TalentLayerID(_talentLayerIDAddress);
     }
 
     // =========================== User functions ==============================
 
-    function mintDelegateAndTransfer(address _to, address _delegateAddress, uint256 _platformId, string calldata _handle) external payable {
+    function mintDelegateAndTransfer(
+        address _to,
+        address _delegateAddress,
+        uint256 _platformId,
+        string calldata _handle
+    ) external payable {
         // Mint TLID token
         uint256 tokenId = talentLayerIdContract.mint{value: msg.value}(_platformId, _handle);
         // Add address as delegate
@@ -33,8 +36,12 @@ contract TalentLayerIdUtils is IERC721Receiver {
 
     // =========================== Overrides ==============================
 
-    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external pure override returns (bytes4) {
+    function onERC721Received(
+        address operator,
+        address from,
+        uint256 tokenId,
+        bytes calldata data
+    ) external pure override returns (bytes4) {
         return this.onERC721Received.selector;
     }
-
 }

contracts/TalentLayerPlatformID.sol

@@ -502,10 +502,14 @@ contract TalentLayerPlatformID is ERC721Upgradeable, AccessControlUpgradeable, U
     }
 
     /**
-     * @dev Override to prevent token transfer.
+     * @dev Implementation of the {ERC721Upgradeable-transferFrom} function.
+     * @notice Only one Id allowed per account.
      */
-    function _transfer(address, address, uint256) internal virtual override(ERC721Upgradeable) {
-        revert("Token transfer is not allowed");
+    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
+        require(balanceOf(to) == 0, "Recipient already has a Platform ID");
+        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
+
+        _transfer(from, to, tokenId);
     }
 
     /**