making shipping method option depending on order value

[ronnie75]

This is the idea:

 

I want to have an option to ship to the customer with a shipping module like flat.php, but once a certain maximum order value is reached this shipping option should be unavailable. I want this option because this shipping option involves risk (of the customer not paying) and i want to have a set maximum order value that the order can have.

 

So my guess is, somewhere in the flat.php (maybe the display function) i need to check the total order value against a maximum amount (which could be stored in the dbase) and decide whether to display the shipping method or not.

 

Can anybody help me with this?

Thanks in advance!