We value your unique insight into our products and services and often receive ideas and feedback from our community in a variety of ways. To streamline this process, we’ve created an idea bank where you can post product suggestions, vote for those most important to you, and add comments to existing ideas.
I generated widgets for my campaigns using this tool: https://widgets.justgiving.com/builder/fundraisingpage (also linked from this article: https://help.justgiving.com/hc/en-us/articles/201320952-Build-a-widget-for-your-website-or-blog).
However, when clicking the Donate button, users are forced to log in, they are not given the option to donate as a guest (which you can find in the main campaign web page).