Send the output of a PHP script directly to Woocommerce

Hi

I’m for a way to send the output of a PHP script directly to Woocommerce

I’m writing a php script for a delivery company

The user will fill in a form which will take weight and dimensions and where is being collected from and going to and calculate a price based on that.

I’d like Woocommerce to handle the order once those calculations have been made.

So basically, I’m looking for a way of returning those variables (order details and price) to the Woocommerce checkout page.

Any ideas where I’d start?