Tiltify is a fundraising site that allows users to create campaigns for charities they'd like to raise money for and support. The user can either choose to raise money as an individual or be a part of events. To get started, visit their site and start following the prompts to setup your first campaign.
After you've finalized all the details of your published Tiltify campaign and you're ready to add it to your project, copy your donation overlay URL (found in your campaign overview) and head to your Lightstream project.
Once there, click the green "Add Layer" button, select 3rd Party Integration, and then select Tiltify from the integration list. After it's been added, simply paste the url you copied into the layers list and you're good to go!