Subscription Based products

Currently I have courses that are setup as products on my site. They purchase the course for $40.00 and then have access to that course.

I would now like to set this up so that each course can be purchased on a subscription basis (1mth, 3mth, 6mth, 1 year) each having a different price.

Would I have to create separate products for each subscription length or can I modify my ecart somehow to work with subscriptions?

Do you have a tutorial for a setup like this?

My Site: www.corelearningonline.com

No tutorials for this that I know of.

Are you trying to do subscription with automatic recurring billing or just a limited time membership?

Limited Time Membership.

Should be relatively easy then. You could do it with separate products, or just change the price of a single product. Either way you would store the timestamp of the purchase and then add a column to the cart to store the duration of the membership.

For ease I would probably just do it as separate products.

You would then be able to update your SQL statement you are currently using to give access to the course so that it accounts for the time of the purchase and the duration so that it is only available for that limited time.