Are you a QSA?
No. A Qualified Security Assessor performs the formal assessment and signs a Report on Compliance. I prepare you for that assessment, or help you complete a Self-Assessment Questionnaire, which your company signs.
Which SAQ do we need?
It depends on how you accept cards: fully outsourced e-commerce, embedded payment pages, card-present terminals, or systems that store card data each point to a different questionnaire. Your acquirer has the final say.
If we use Stripe or another processor, are we out of scope?
Rarely entirely. A well-designed integration can shrink your scope to a short questionnaire, but your website and the systems that control the payment page usually remain in scope.
Is PCI DSS a law?
No. It is a standard enforced through contracts with your acquiring bank and the card brands, though some state laws reference it.