No, and no payments API should tell you otherwise. Delivery is at-least-once, so key on the event id and treat a repeat as a no-op.
Every attempt is kept for thirty days and can be replayed, and a replay reuses the original event id.
Getting started
Post here and you will get a first reply within the hour, at any time of day.
Anything affecting live payments should go to the number in your account handbook, which reaches somebody directly.
Security
Only at the lightest level, provided card details go straight from your customer's browser to us and never touch your servers. That is what the hosted fields are for.
The moment a card number passes through your own systems the obligation changes considerably, which is why we will not store them for you.
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Ridgeway