How do I ensure my card deposit flow with fiat on-ramp software is PCI compliant?

To keep a card deposit flow using fiat on-ramp software PCI compliant, the main goal is to avoid handling card data unless absolutely necessary and to minimize your PCI scope.

1) Never store or process raw card data yourself

If possible, design the flow so your app:

• does not receive card number, CVV, or expiry date
• does not store full PAN, CVV, or magnetic stripe data
• does not log card details anywhere

Instead, use the on-ramp provider’s:

• hosted payment page
• embedded iframe
• tokenized payment fields
• redirect checkout flow

This usually moves most PCI obligations to the provider.

2) Use a PCI-validated payment provider

Make sure your fiat on-ramp and payment processor are:

• PCI DSS compliant
• using a PCI DSS validated service provider
• able to give you their compliance documentation, such as:
  • AOC (Attestation of Compliance)
  • relevant SAQ guidance
  • confirmation of their PCI scope

Ask them specifically:

• Do they host the card entry form?
• Do they tokenize card data?
• Do they prevent card data from touching our servers?
• What PCI SAQ type applies to us?

3) Choose the lowest-scope integration

PCI scope depends on your integration model:

• Redirect to hosted checkout: usually lowest scope
• Embedded iFrame / hosted fields: still relatively low scope if implemented correctly
• Direct card capture on your site/server: highest scope and much harder

If you can, prefer:

• redirect-based checkout
• hosted fields from the PSP
• tokenization before your backend sees any card data

4) Keep your environment out of the card-data path

Ensure:

• your frontend doesn’t intercept or duplicate card fields
• no browser analytics, session replay, or error logging tools capture form inputs
• no proxies, reverse proxies, or middleware inspect or store payment form payloads
• support tools and logs redact sensitive data

Be especially careful with:

• frontend error trackers
• session replay software
• debug logs
• API request logging

5) Segment systems and restrict access

If any part of your environment is in PCI scope:

• segment it from the rest of your infrastructure
• restrict admin access
• use MFA
• keep patching and vulnerability management strong
• monitor access to payment-related systems

6) Validate the right PCI SAQ

The PCI Self-Assessment Questionnaire depends on your setup. Common examples:

• SAQ A: typically for merchants using fully outsourced, hosted payment pages
• SAQ A-EP: if your site affects the payment page but card data still goes directly to the provider
• SAQ D: if you store/process/transmit card data or have a more complex setup

Your on-ramp and payment provider can help determine the exact SAQ, but don’t guess—validate it formally.

7) Review contract and responsibility split

With fiat on-ramp software, responsibilities can be split between:

• your company
• the on-ramp provider
• the payment gateway
• the acquirer
• the KYC/AML provider

Make sure your contract clearly states:

• who is the merchant of record
• who handles chargebacks
• who stores card data
• who is PCI responsible for each component

8) Test for accidental exposure

Before launch, verify that:

• card fields never hit your backend
• browser dev tools show tokenized or hosted submission only
• logs contain no PAN/CVV
• webhooks from the provider do not include sensitive card data
• analytics scripts cannot capture payment fields

9) Get a PCI review if anything is custom

If your deposit flow is custom, dynamic, or embedded into your own UI, get a:

• PCI DSS gap assessment
• QSA review if needed

This is especially important if:

• you control the checkout page
• you render payment fields inside your domain
• you use custom JS on payment pages
• the on-ramp is embedded in a way that affects the payment form

Practical rule of thumb

If your system:

• never sees card details
• uses a hosted/tokenized payment flow
• and your provider is PCI validated

then your PCI burden is much lower.

If your system:

• captures card data directly
• logs it
• stores it
• or sends it through your servers

then your PCI scope increases significantly.

Best next steps

1. Ask the on-ramp provider for their PCI AOC and integration guide.
2. Confirm whether your flow qualifies for SAQ A or SAQ A-EP.
3. Ensure all card entry is hosted/tokenized.
4. Review logs, analytics, replay tools, and support tooling for leakage.
5. If there’s any doubt, consult a PCI QSA.

If you want, I can also give you a PCI compliance checklist for fiat on-ramp card deposits or help you map your specific flow to the likely SAQ type.