Here is a link to a great IRS publication for those interested.
http://www.irs.gov/pub/irs-pdf/p1771.pdfHere are the guidelines for the receipt excerpted from the pub for the purpose here:
1. name of organization
2. amount of cash contribution
4. statement that no goods or services were provided by the organization in return for the contribution, if that was the case
5. description and good faith estimate of the value of goods or services, if any, that an organization provided in return for the contribution
It is not necessary to include either the donor's social security number or tax identification number on the acknowledgment.
Here are some sample letter... for the purpose of the programming, it might be best to allow admin created text through the use of text boxes, similar to that of the language fields available now.
{NAME}
{ADDRESS}
{CITY}{ST}{ZIP}
Dear {NAME}
Thank you for your cash contribution of {AMOUNT} that {ORGANIZATION'S NAME} received on {CONTRIBUTION DATE}. No goods or services were provided in exchange for your contribution.?
<<OPTIONAL ADDITIONAL PARAGRAPH>>
In exchange for your contribution, we gave you a cookbook with an estimated fair market value of $60.
<<OPTIONAL - SINCE YOU GIVE ADMIN CONFIGURABLE OPTIONS.. THIS MAY TIE TO THOSE OPTIONS>>>
Your donation is being applied to the <<OPTION>> as you requested.
Our organization is appreciates your generosity.
Very truly yours,
{ORGANIZATION'S NAME}