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Pay once by card and get an API key. Send it as an X-API-Key header on any paid card route (for example /delta/AMD or /policy/BOE) and you get the same card JSON as an x402 payment. Each card uses 1 credit; a bundle uses 1 credit per card in it. Credits do not expire.
Card payments are processed by Stripe. FilingDelta never sees your card number. Your key is shown once on the page you return to after paying, so copy it then. See terms (including refunds) and privacy.