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contracts/CubLearn.sol

@@ -35,6 +35,14 @@ contract CubLearn is Ownable {
 		cashbackPercentage = 50;
 	}
 
+	function amIEnrolledInCourse(string courseId) external view returns (bool) {
+		return enrolledCourses[courseId][msg.sender];
+	}
+	
+	function didICompleteCourse(string courseId) external view returns (bool) {
+		return issuedCertificates[courseId][msg.sender];
+	}
+
 	function setCashbackPercentage(uint256 newValue) external onlyOwner {
 		require(newValue <= 100, "Cashback percentage cannot be more than 100.");
 

contracts/DTLToken.sol

@@ -12,7 +12,15 @@ contract DTLToken is ERC20 {
 		return 0;
 	}
 
+	function getAllowanceOfSpender(address spender) external view returns (uint256) {
+		return allowance(msg.sender, spender);
+	}
+
 	function approveMax(address spender) external returns (bool) {
 		return approve(spender, totalSupply());
 	}
+	
+	function getMyBalance() external view returns (uint) {
+		return balanceOf(msg.sender);
+	}
 }

contracts/NftCertificate.sol

@@ -48,15 +48,15 @@ contract NftCertificate is ERC721 {
 		});
 	}
 
-	function getCertificateInfo(uint256 tokenId)
-		external
-		view
-		returns (
-			CertificateInfo memory certInfo
-		)
-	{
-		return certificateInfoMapping[tokenId];
-	}
+	// function getCertificateInfo(uint256 tokenId)
+	// 	external
+	// 	view
+	// 	returns (
+	// 		CertificateInfo memory certInfo
+	// 	)
+	// {
+	// 	return certificateInfoMapping[tokenId];
+	// }
 
 	function _getSvg(uint256 tokenId) internal view returns (string memory) {
 		CertificateInfo storage certInfo = certificateInfoMapping[tokenId];