You could create a "Miscellaneous Payments" product, in its own category by the same name, and set it at a price of $1.00. The customer can enter the quantity to purchase, and will be charged that amount. Add a text input attribute so they can describe right there what the payment is for; you will also have to decide if this will be "taxable" (tax added to the amount entered) or total as is. You would probably want to set the shipping to free, or make the product virtual with no shipping information required. See my site for an example: Wedding & Betrothal > Custom Rings > Custom Project.



