I took a "free" trial of Onepass yesterday when they had something at Catch I thought was value. However, when shipping & delivery was applied the purchase became pointless.
Back to the question, if they're charging for delivery what is the point of Onepass?
Haven't used it but the website suggests delivery is included in $4/month: https://onepass.com.au/benefits
You may have been looking at an item sold by a third party seller?