The products leaf label () represents the products quality.
If you purchase a product with higher quality, you will obtain a larger bonus payment.
This graph shows how much the bonus payment can be, depending on the star label.
Products with:
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2 will grant between {{ S2l }} and {{ S2h }} and {{ Constants.Currency }}
3 will grant between {{ Constants.S3l }} and {{ Constants.S3h }} and {{ Constants.Currency }}