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Our product is performance-based, rather than unit-based, and there's no exposed API. We would like to have a detailed itemized invoice (think a phone bill). Our options are build from scratch or shoe-horn existing solutions. It'd be nice to not have to reinvent the wheel and also keep our customers within our UI.

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Could you provide some examples of performance-based billable services?

Our company audits shipping invoices and bills the customer based on a percentage of what we save them. It's a common business model outside of the tech/SaaS landscape (utility bills, property taxes, etc)

I guess there's a lot of complexity I'm missing. Is it something like this:

1. Customer original bill (variable - user provided) e.g. 100

2. Saving (variable - user provided) e.g. 9

3. Saving percentage (calculated) e.g. 9%

4. Billed Percentage (variable based on savings percentage?) e.g. 25% x 9

So you would have a billed percentage "rate card" that depends on variable factors like the customer bill plan, the amount/percentage saved etc? Is that the tricky bit?

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