How to get information from order number

Helllo, I’m trying to code a return form for returning products but I can’t find out how to check if an order really exists, by getting the information from the number itself: URL: Returns and Refunds – InteriorGlows looks like this

And I got this code:

document.addEventListener('DOMContentLoaded', function() {
  // Get the "Check Order" button
  const checkOrderBtn = document.getElementById('checkOrderBtn');

  // Add event listener for the button
  checkOrderBtn.addEventListener('click', function() {
    // Get the form elements
    const nameField = document.getElementById('ContactForm-name');
    const emailField = document.getElementById('ContactForm-email');
    const orderNumberField = document.getElementById('ContactForm-order-number');
    const returnTypeField = document.getElementById('ContactForm-return-type');

    // Check if all required fields are filled
    if (!nameField.value || !emailField.value || !orderNumberField.value || !returnTypeField.value) {
      alert("Please fill in all required fields.");
      return;
    }

    // If all fields are filled, proceed with order check
    var orderNumber = orderNumberField.value;
    var orderExists = checkIfOrderExists(orderNumber);

    if (orderExists) {
      alert("Order found!");
    } else {
      alert("Order not found.");
    }
  });

  // Simulated function to check if the order exists
  function checkIfOrderExists(orderNumber) {
    // How can I check if order really exists and get the information from it
    
  }
});

But I do not know how to get the order information (if it exist) from the variable orderNumber. Can anyone please help me get it

you need the code for the path. if you look at main-register you can see an example of the code has the info go to the account. something like:

I have items go to the notes section of the account using “customer[note]” in the input class. you need the code for the order notes