First, you have to submit 10 images, so the inspectors can examine them. If 7 of them have passed the exam, you are free to contribute. If you failed, you can try the second time but in a month.

The minimal size of the images is 4 MP.

To register you have to send a scan of the biometric section of your passport.

If you have a referral submiter, you recieve $0.03 from every his sold image, till you are a Shutterstock submitter.

You may give the referral link to up to 10 photographers.

When registered, the photorgapher has to fill in the form like the following:

"How Did You Hear About Us?"-  from user id 92519 (your personal id)