You can purchase more credits on the “Billing” page. 

Select the “Purchase Credits” option. Once you have chosen a package — Small Package (40 images for $79), Medium Package(170 images for $299), or Large Package (1,000 images for $ 1,599) — input your payment information, and you're ready to go.

You can pay using a credit card (including AMEX) or PayPal.

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