Not the best way, but we got around this with this method, First I can not post what site we are due to the nature of our business, but here it is,,, Each user creates a product "Add product" this can be called "tip me" or donate, The prduct has the value they can set , Our "members" can do well with is, We also allow then to create a product called Amazon Gift card this links to amazon they buy the card and send the link in messages to the member of our site, this way they can have an Amazon Wish List . Just an alternative to donate in other ways and simple to do. We also have a website that sells Items in the same context as our site and they can build a wish list and gift card system on that too, I prefer this as it keeps the income coming in from that site too. Promotion is key of course we are learning all the time and it changes all the time