Adding logo to shipping options in cart

Hi,

I need to add logos of shipping options in cart.
I had a look here on this snippet like you suggested on another topic: https://stackoverflow.com/questions/58225336/adding-custom-icons-to-the-shipping-options-in-woocommerce-cart-and-checkout

However, do you know where I can find the method ids ?

Thank you for your answer.
Best regards,

Julien