I was trying to call the ckSepoliaUSDC but I got an error

[b3hr4d]

You need to convert user principal into bytes32 format, Please take a look at this tutorial:

Building a Cross-Chain ETH Payment and E-Commerce Platform on the Internet Computer: A Step-by-Step Tutorial

Step 2: Modify the Backend for ETH Deposits In this step, we’ll modify the backend to include a function that generates a deposit principal from a canister ID. This is essential for converting SepoliaETH into ckSepoliaETH, as per the ckEth documentation. Installing the b3_utils Rust Crate First, we need to install the b3_utils Rust crate. Open your Cargo.toml file and add the following line under [dependencies]: b3_utils = "0.8.0" or run this command: cargo add b3_utils Modifying the greet …