These programs will be clearly listed online, like Amazon’s and they’ll have guidelines for who and who doesn’t qualify. There will likely still be a review or approval process, but this isn’t typically selective except perhaps for factors like how much site traffic you get or domain authority. It’s simple and it typically doesn’t take long to get approved, if approval is even required.
As you already know, mobile marketing is all the rage. More and more people are using their phones to purchase, opt in, and get their daily dose of content. In fact, Affiliate World Asia 2016, concluded that mobile use would be the future in affiliate marketing trends and that has proven true in 2019.

Affiliate marketing can help you to drive interested consumers to your product pages. But it’s your job to make sure that they buy your product once they reach there.
Invoice Ninja, a free open-source invoicing app for freelancers and businesses, offers a Ninja Pro Plan for just $10 a month — and, as an affiliate partner, you can make 50% on all referrals for four years. That means, if you refer 100 Pro users, you'll receive $5,000 every year for the next four years.