Shipping a package across country lines usually incurs higher costs. If you’re a business that sells products to an international audience, you probably pass those costs along to those customers by charging a higher shipping and handling fee depending on their location. If this is something you’d like to do on your payment-enabled Wufoo form, read on and we’ll show you how you can conditionally attach an international shipping fee based on their input into an address field.

##1. Build a Payment-enabled Form with an Address Field

You’re all probably old pro’s at this, but just in case, you can learn about building your own forms here and making them payment enabled here. Just make sure your form is collecting an address that’s collecting the Country your user is from–a very easy thing to do with our fancy pants “Address” field.

##2. Add a Checkbox for International Shipping

Don’t worry, your users won’t see it. We just need it there because we are going to attach our fee to this particular checkbox and control it programatically from the back end.

Create a multiple-choice field with **1)** only one option labeled “International Shipping” **2)** No title **3)** Pre-checked (click the checkbox next to where you label it) and **4)** has the CSS Keyword “cloak” (this will keep it invisible).

##3. Add a Field Rule

To make this international shipping charge conditional based on the country they select, we need to add a Field Rule. Back at the Form Manager, click the **Rules** button beneath that form and click the New Rule button to add a new Rule.

What we want to do is HIDE our international shipping checkbox (so it won’t be a part of the payment calculation) in the event that the country dropdown be either **blank** or **our home country**.

##4. Attach a Payment Amount to the Checkbox

The logic is now in place. If a country is selected that isn’t the home country, the checkbox for international shipping is “shown” (still visually hidden, but now can participate in payment calculation). We just need to make sure there is a value attached to it. Head back to the Form Manager and click the Payments button beneath the form.

This screen is where you set up all your payment settings, including assigning prices. In this simple example, there is a base price of $15.00. We then selected the checkbox from the “Assign Prices to Field” dropdown and applied the $5.00 fee.

##5. And You’re Done

That’s all there is to it! If you want to see it in action, see our live example here. You can see it work in the Running Total area of the form. And if you submit the form, you’ll be redirected to PayPal where you can see the correct total passes along.