Alan: You can achieve the same results with a Text widget, which also accepts HTML code.
If you want to make your plugin unique, then perhaps having it generate the HTML code based on account information or something even simpler to that effect would be acceptable. For example, you could have it go retrieve the necessary code directly, or you could have the user put in their account number (or whatever) instead of copy and pasting HTML.
Also, you need to state in the description of the plugin that it requires a subscription service. This is to avoid misleading users into downloading it only to discover that it is a for-pay service.
Like I said, we accept GPL plugins, even for pay-services. However, we don't want our users to be misled about what the plugins do.
If you make the change to the description, I'll re-enable it. However, I would also encourage you to improve the plugin and make it unique and easier to use. This is not a requirement, just a suggestion.
Feel free to email me directly if you want to discuss this further: otto@ottodestruct.com