What is the difference between the Starter and Pro plans?

The difference between the plans is in the features and auto-pay fees.

The Starter plan is restricted to 1 affiliate group, a maximum of 10 affiliates, and 1 referral link per affiliate. The Pro plan has no restrictions, which enables you to have unlimited affiliates, groups, and referral links.
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The Starter plan supports standard referral links with random IDs, which is sufficient for most basic affiliate programs. A standard link will look like this: www.youstore.com/r?id=ie3ejs. The $39/mo Pro plan lets you create "custom links". With these links, you can replace the random ID with a text of your choice, so you can have links like this: www.yourstore.com/yourname.
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The $39/mo Pro plan also lets you generate unique discount codes for your affiliates, that they can use to generate referrals. This means affiliates can share a discount code with their followers and if that code is used at checkout, the customer will get a discount, and the affiliate will get a commission.

In addition, the $39/mo Pro plan also enables you to set Product specific commissions, and Permanent customer connections.