No one likes to be charged - Make it less painful next time - petithacks
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Petithacks   digitalocean
No one likes to be charged - Make it less painful next time DigitalOcean knows how to take advantage of their monthly invoices received by XX Million per month - IF their clients want to see a cheaper charge in the next month, they make sure to include a link to their referral system in evey invoice.
Referral