Do you have an American Express credit card? If you do, are you aware that you may have the ability to share referral links with others that will earn you tons of bonus points?
Checking For Referrals
Signing in here will take you to a landing page that should show any/all offers available for you to refer.

However, that page will only give you the option to send a referral link through email. If you simply want the URL, then sign into your Amex account and scroll down below the statement balance, payment, and rewards boxes.