Hi,
Hoping someone can help me :)… I’d like to add a Service Fee of 18% to 20% to all orders automatically at checkout… The logic would look something like this.
calculate the total of cart, add item “Service Fee” to cart (can be a product). If total cart value <$1500, Service Fee value =_.20, if total cart value >$1500, service fee value =_.18 of total cart.
And then add a flat $10 local delivery charge.
Any help would be very much appreciated!
Thanks Much!!! 
Hello,
The ‘service fee’ would need to be a product but you will find it difficult to apply exact percentages.
I would create variants of the service fee product to match cart totals with specific service fee prices. You could then have 100 different options to charge as a service fee e.g
variant name: 1000 ($10 - in cents is probably easier)
variant price: $2
variant name: 2000
variant price: $4
etc.
You would then need to use some front-end code to match the current cart total with a variant name and add the correct variant to the cart.
There might be an app that does this if you are not comfortable editing code.