JustGiving has been providing a number of charity challenges held both virtually and live-action - most recent challenge examples have been 2.6 Challenge, 5K May (Run for Heroes), and Captain Tom 100 (Macmillan Cancer Support).
These challenges are 'partnered'. A main charity partners with JustGiving to deliver the challenge, but other charities are also able to fundraise using the bespoke campaign 'Get-Involved' URL, and the resource toolkit that is provided.
Fundraising Charities will receive the majority of the donations received minus a small percentage (this should be confirmed in the toolkit that JustGiving provides), for example, 5k May a 5% fee is passed to Run for Heroes.
Each charity participating will have its own 'page' on the challenge microsite. This page features the charity's JustGiving Charity ID which is then used to pass the funds through to the charity's JustGiving account.
The funds and supporter details will be listed in your own Charity's JustGiving account by the Appeal Name, for example '5K May'. This Appeal Name can be used for reporting within your own Charity's JustGiving account.
So that the funds and donor details are passed into Donorfy and don't get added to your default campaign, you will need to create a Campaign in Donorfy called the same as the Appeal Name in JustGiving, then all the details should automatically be added to this Campaign.
There are no details about how the partner charity fee will be taken - we can only assume that it will be from each transaction and added to the processing costs. This would then be attributed to the transaction in Donorfy within the Processing Costs field (the field is a total field and does not provide a breakdown of the costs to an individual level).