Add each widget to OBS as a browser source using its URL.
Total raised, QR code and the latest donations, for down the side of the stream.
OBS size: 300 × 1080
https://readathon.craigpetterson.co.uk/just-giving/donations
Pops up with a chime for each new donation. Tick “Control audio via OBS” on the source.
OBS size: 500 × 250
https://readathon.craigpetterson.co.uk/just-giving/alerts