I’m looking at correcting the fee tag on a car park. The car park is at RSPB Loch Leven, and the policy is that RSPB members can park for free, non-members are charged £3. How can I add this condition to OSM? The documentation (Key:fee - OpenStreetMap Wiki) gives an example of a condition where customers are not charged, but I’m not sure if OSM has a way to differentiate between members of an organisation, and non-members.
It would be done as a conditional charge something like:
fee=yes + fee:conditional=no @ RSPB members.
I’m sure that somebody better than me on conditions, will be along soon to correct the layout! 
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The tagging is very rare, so it’s more or less your choice what you put there as the condition.
I would do it like Fizzie, except only mention members. Then also include the brand. E.g.
brand=RSPB
brand:wikidata=Q1892802
membership=yes
fee=yes
fee:conditional=no @ members
charge=3.00 GBP
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Thank you for your advice. I will add the tags you suggest Jofban.
There is a similar situation for National Trust Car Parks, as well as
entrance to properties.
Maybe English Heritage and CADW as well.
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