How to purchase an Additional Credits Pack?

If you test a lot

First of all, you should have your billing info (address, zip, VAT (for companies)) set at the Billing page, and payment information added at the Payment info pop-up:

cred_0

payment_1


At the same Billing page, simply press 'Buy more' button at the 'Remaining API tests' section and get one of pop-ups:

For users that must pay VAT tax:

cred_1


And for other users:

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Select the desirable Credit pack and proceed.

Notice: extra credits do not expire, they start to be used only after you use all your 'plan' credits (given monthly).