Invoice Simple has launched a referral program that gives you an easy way to spread the word about Invoice Simple with your peers. For every referral that results in a subscription, you will receive a $20 gift card sent to you via email. Additionally, you receive a 50% discount on your first 6 months of your next subscription renewal.
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To send a referral, go to the app settings and hit Refer & Earn under the account header.
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From here, you can hit Share Link to email the link to the person you are referring.

Alternately, you can refer someone by using this link.