The most common way to earn cash back on purchases is with a cash-back credit card. But while a credit card is a great tool for building credit, there are many legitimate arguments against using one. If your spotty credit or personal preferences preclude you from applying for a credit card, don’t sweat it. You have plenty of other opportunities to earn cash back on purchases made in the comfort of your own home. Look into these options:

If you’re serious about making money selling things online, it’s pretty much impossible to not recommend Shopify. The platform gives you everything you need to get your online store up and running in less than a day including a custom domain, beautiful templates (so you don’t need design skills), secure payment options, and they can even take care of marketing and shipping for you. Whether you’re promoting your own products, designs, or curating other products for people in your niche, Shopify is the best option for powering your online store.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
Every year, hundreds of millions of documents are notarized in the United States: wills, mortgages, citizenship forms, handgun applications. While for decades, this has all been done in person, there is a budding crop of sites that allow notaries to take their services online. If you’re already a notary, you can sell your services online. Or, if you want to get started, check out the National Notary’s checklist for becoming a certified notary.
Ebates: This app offers a simple way to make money online by buying whatever you're already buying and then getting a cash-back reward. With eBates, there is no scanning receipts. Simply click a link in the app and buy it from the store. You'll automatically be credited with your cash rewards upon purchase along with receiving an email confirmation.  
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