The basic PayPal item button code an HTML Form. You need to find out how MeetUp handles or even allows HTML Forms. Note, some web sites do not allow the insertion of HTML Forms however, they do permit text or hyperlinks. If that is the case, then you can use the email version of the item button code you created.
You can build your own Button Text Links from scratch or take advantage of the Online Button Creator within your PayPal Account. After generating the button code online, select the "Email" tab to view the Text Link Code. Note, the "Email" tab will not be available if have included dropdown selections or text boxes in your item button code. This is because you cannot include dropdown selections or text boxes in a Text or Hyperlink.
Regards,
skier
