Hi,
the POST endpoint contains already the join and renew fee parameters.
* @apiparam \IPS\nexus\Money joiningFee Cost to join the club (Nexus must be installed, paid clubs must be enabled, and the owner must be allowed to create paid clubs)
* @apiparam \IPS\nexus\Purchase\RenewalTerm renewalTerm Renewal term for the club (joiningFee must be set)