One option is to create an email text link version of the Donation item button code.
Assuming you have a Business account.
* Login to your account.
* Select on Tools.
* Click on All Tools.
* Click on PayPal Buttons.
* Choose the Button type you want to make.
* For example: Buy Now.
* Click on Select Button.
* Enter the info you need.
* In step 2 you have the option to save the code at PayPal or not.
* When finished with all the details.
* Click Create Button.
* On the next screen you will see the generated code.
* Click on the Email tab - that will display the code you need.
* Click on Select Code - then copy and paste the code in your email or document or web page.
* Done.
Note, the "Email" tab will not be available if have included drop down selections or text boxes in your item button code. This is because you cannot include drop down selections or text boxes in a Text or Hyperlink.
