What are accepted ways of splitting publication fees among coauthors, when authors are from different research groups and potentially even different institutions? Especially with open access publication, the fees tend to come out at a substantial amount.
In general, the corresponding author seems to be responsible to the journal for the payment of the fee. I wonder what would be commonly acceptable agreements with coauthors to split such fees?
There is already a general question on splitting collaboration costs here, but the current answer does not apply to publication fees, and I am really interested in this specific case.