How do I purchase an admission to Jasper national park in Canada?

I am shortly travelling to Canada to do an RV trip with my wife. The middle itinerary looks like:

Day 5 - Arrive in Jasper & stay in Waipiti Campsite for 2 nights
Day 7 - Move to A Campsite in Rampart Creek
Day 8 - Move to Lake Louise Campsite for 2 nights

I've read a lot both here on the official parks website and on multiple other websites that I need to buy a pass. I have no problem with that.

What I'm confused about is when I actually buy the pass, and whether I need multiple for the different stays. I have already booked my campsites in the three locations due to the size of the RV.

So My Question Is: How & When Do I buy passes for the Canadian national parks?

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How do I purchase an admission to Jasper national park in Canada? - Body of Water Near Mountain Peaks

How do I purchase an admission to Jasper national park in Canada? - Green Pine Trees Surrounded by Flowing Water

How do I purchase an admission to Jasper national park in Canada? - World War I domed memorial with columns against overcast sky

Do you have to pay to enter Jasper?

Some Parks Canada fees will be changing beginning in January 2023. More information is available here....Daily.*Adult$10.50*Senior$9.00*Youthfree*Family/Group$21.00*Commercial Group, per person$9.00Mar 26, 2020

Do you need a park pass to stop in Jasper?

Anyone visiting, stopping for picnics and viewpoints, or visiting lakes and villages must purchase a pass. Anyone traveling the Icefields Parkway (aka Highway 93) also must purchase a park pass.

Do you need a Banff pass for Jasper?

You do not need a separate pass for each park. You can visit all the Rocky Mountain Parks such as Banff, Jasper, Yoho, Kootenay, Mount Revelstoke, Glacier, Waterton Lakes and Elk Island National Parks with the same pass.

How much does it cost to get into a National Park in Canada?

* The entrance fee to a Parks Canada national park is around CAD$10 per person. An annual pass for 2 (or more) adults will therefore pay for itself in as little as 7 days (even without spending the night in the park). * Admission to Parks Canada sites is free for youth 17 and under!

TOP 10 PLACES TO VISIT IN JASPER NATIONAL PARK, CANADA

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Images: James Wheeler, James Wheeler, James Wheeler, Gotta Be Worth It