Sorry, but who ever told you to use the Donation button was incorrect.
Use the Buy Now item button code -
If you want to allow your customers to input an amount on the PayPal Screens for a Buy Now Button, just enter a "0" in the "Amount" Field when you are creating the button. This method works for people who want to use the online button creator. Note, this will not work for Add to Cart item buttons.
Another option is manually create your item button code whereas you can create a simple form and the customers can enter an amount and any other info on a web page. See the example below:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Buy Now Button Example</title>
<!-- START META TAG SECTION -->
<meta charset="utf-8">
<meta name="description" content="">
<meta name="keywords" content="">
<!-- END META TAG SECTION -->
</head>
<body>
<!-- START SAMPLE CODE SECTION -->
<!-- PARAGRAPH 1 -->
Pay Your Bill Online Examples
<br><br>
Buy Now - Customer Enters Amount, very simple.
<br><br>
<hr align="left" width="50%" noshade>
<br><br>
<!-- START CONTENTS -->
<!-- START BUTTON EXAMPLES -->
<form target="_self" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="on0" value="Customer Number">Please Enter Your Customer Number:
(Example: 99999999)
<br><br>
<input type="text" name="os0">
<br><br>
<input type="hidden" name="on1" value="Invoice Number">Please Enter Your Invoice Number:
(Example: 99999999)
<br><br>
<input type="text" name="os1">
<br><br>
Enter Amount Due :
(Example: nnn.nn)
<br>
<input type="text" name="amount">
<br><br>
<input type="reset" name="reset" value="Clear Selections">
<br><br>
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
<input type="hidden" name="cmd" value="_xclick">
<!-- Replace "business" value with your PayPal Email Address or your Merchant Account ID -->
<input type="hidden" name="business" value="your PayPal Email Address or your Merchant Account ID">
<input type="hidden" name="item_name" value="Online Payment">
<input type="hidden" name="item_number" value="OLP-00001">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="shipping" value="0.00">
<input type="hidden" name="tax" value="0.00">
<input type="hidden" name="button_subtype" value="services">
<input type="hidden" name="no_note" value="0">
<input type="hidden" name="country" value="US">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_paynowCC_LG.gif:NonHosted">
</form>
<!-- END BUTTON EXAMPLES -->
<!-- END SAMPLE CODE SECTION -->
<br><br><br><br>
<hr align="left" width="50%" noshade>
<br><br>
NOTES:
<br>
In order to test the code, you must replace the "business" value variable with your PayPal Email Address or your Merchant Account ID.
</body>
</html>
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