The Groupon order is meant to be able to provide users with an invoice that has only taxes or is $0 (depending on if you charge taxes in your area). The customer will pay Groupon upfront for $100 in window cleaning, with 50% off of it (or some variation of this discount).

Groupon workflow overview:
1. The customer buys "$100 worth of window cleaning for $49" discount on Groupon.
2. The customer pays $49 to Groupon.
3. Your Company receives the orders and schedules it in.
4. Your Company must charge taxes (if taxes are applicable) on the $49 dollars the customer paid Groupon.
5. Your Company will receive a cheque from Groupon for X% of the purchase price.

In Better, the ability to handle the above workflow is created using a bundle of 3 products:
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​Product 1: The initial product that's $100: This represents the initial purchase of the pre-discounted item the customer buys.  This product has taxes applied to it.

Product 2: The discount line item: A -$51 line item. This represents the deal the customer is receiving from Groupon. This is essentially the discount on the $100 line item. This product has taxes applied to it.

Product 3: The amount the customer paid to Groupon but captured as a negative amount: In this example, a -$49 line item. This represents what the customer paid Groupon. The customer has already spent this money when making the purchase on the Groupon site. This product is tax-exempt.

Optional Product 4: Adding a small fee associated with travel and fuel charges.  
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The products are organized in this way in order to calculate the correct amount of taxes that a customer may be required to pay.  A customer does not pay taxes to Groupon, there must be a separate transaction from the business providing the service.  

Once the Groupon products have been created, they will need to be organized into a bundle.  Press here to learn more about creating a bundle using existing products.  

Here's how the taxes are calculated for this example order using the steps above:
1. Product 1:  The full value of the services being provided before a discount is applied.  In this example, the full value of the services was $100.
• This item has applied taxes to it.
• This will calculate $100 worth of taxes on the order.
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2. Product 2: The discount that is required to discount the value of the services to the amount the customer paid Groupon.  In this example, a discount of $51 was applied to the Groupon order.  
• This item has taxes applied to it.
• This will calculate -$51 worth of taxes on the order.
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3. Product 3: A discount is used in the third product for the amount the customer paid directly to Groupon.  This amount is tax-exempt because the correct tax value has been calculated using Products 1 and 2.  
• This item is tax-exempt.
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Conclusion: There is $100 of taxes and -$51 dollars of taxes, leaving a total of $49 worth of taxes. This is how the accurate tax amounts are calculated for the Groupon purchase.

This example can be followed for Groupon promotions using different service values and discounts.  You will need to create new products for these amounts as well as a new bundle.