Global Modifiers

Global modifiers are adjustments that apply to every shipping rate your rules produce. They run after all rules have been evaluated and conflict resolution has picked a winner for each service code. Whatever rate comes out of that process, global modifiers adjust it up or down.

Use them for things like a fuel levy, a handling fee or a blanket promotional discount, where you want the change to affect every rate, every time.

The four types

Type	What it does
Flat surcharge	Adds a fixed dollar amount to every rate
Percentage surcharge	Increases every rate by a percentage
Flat discount	Subtracts a fixed dollar amount from every rate
Percentage discount	Reduces every rate by a percentage

Modifiers are applied in the order they are listed. If you have multiple active modifiers, each one runs on the result of the previous one.

No rate will go below $0. If the combined effect of your discounts would produce a negative number, the rate is clamped to zero.

Managing modifiers

Go to Settings, then open the Global Modifiers tab.

Add a modifier

1. Click Add modifier.
2. Enter a label, for example “Fuel Levy” or “Summer Sale Discount”.
3. Choose the type: flat surcharge, percentage surcharge, flat discount or percentage discount.
4. Enter the amount. For flat types, enter a dollar value. For percentage types, enter a number like 10 for 10%.
5. Make sure the Active checkbox is checked if you want it to apply immediately.
6. Click Add.
7. Click Save Modifiers to persist your changes.

Edit a modifier

Click the edit icon next to the modifier, make your changes and click Save. Then click Save Modifiers.

Toggle a modifier on or off

Check or uncheck the checkbox next to a modifier in the list. Inactive modifiers are shown with an “Inactive” badge. They stay in your list but have no effect on rates. Click Save Modifiers when done.

Delete a modifier

Click the delete icon next to the modifier. Click Save Modifiers to confirm.

Example

Say you have a rule that returns a $10 standard shipping rate. You add two active global modifiers:

1. Flat surcharge: $2.50 (fuel levy)
2. Percentage discount: 10% (loyalty discount)

The calculation runs like this:

• Start: $10.00
• After fuel levy: $12.50
• After 10% discount: $11.25

The customer sees $11.25 at checkout.

Tips

• Modifiers apply to all rules, including free shipping rules. A surcharge on a free rate will make it no longer free. If that is not what you want, use rule-level modifiers on individual rules instead.
• The Simulator shows which global modifiers were applied so you can verify the math before going live.