Login to your Double dashboard, go to Settings > Installation and copy the installation code.
Login to your ChabadOne site account, and go to Settings.
Under Site Settings, click on General Settings.
Paste the code in the Custom Header Code section and click Save.
Replace the primary donate button
Under the Publishing tab, click New Link.
Choose the My Site folder as the location.
Choose All other links as the link type.
Add
https://your-website.org?campaign=donateas the link, name it Double Checkout and click Save.Go to Settings > Donation Page, and toggle off the Use Integrated Donation Page option.
Choose Double Checkout as your donate page, and click save.
