Donations are a very common use of eCart. Although it is not explicitly called out in any of the interfaces, configuring eCart to receive donations is quite simple.
To allow donations to be received, you need to make the Price option for an Add to Cart button ‘Updateable’. This would allow someone to enter the amount of the donation they intend to give, and add that to their cart for checkout. This How To shows you the steps required to create this type of Add to Cart button.
Since this Add to Cart button does not need to be dynamic, you can apply it anywhere on your site that you see fit.

Since this Add to Cart button does not need to be dynamic, you can apply it anywhere on your site that you see fit.
If you have chosen to make the price column updateable as a select list, you will need to populate those fields with various values. Most likely, you will want to provide values for the most commonly donated denominations.
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