A token vault is a secure system used to store and manage payment tokens—surrogate values that represent sensitive payment credentials (such as a card PAN) without storing the raw card data in operational systems. In EV charging, token vaults are most commonly used to support tap-to-pay, in-app card payments, subscriptions, and recurring billing while reducing the exposure of sensitive data.
A token vault is typically provided by a payment gateway, acquirer, or specialized tokenization service.
Why Token Vaults Matter in EV Charging
Public charging networks handle payments across many users, locations, and transactions. Token vaults help:
– Reduce the need to store card data directly, lowering security risk
– Support PCI DSS compliance by minimizing the scope of sensitive data handling
– Enable recurring billing, postpaid charging, and subscriptions without re-entering card details
– Improve payment success rates by using stored tokens for retries and renewals
– Support refunds, chargebacks, and customer account management workflows
– Protect customers if backend systems are compromised (tokens are not usable like real card data)
How Token Vaulting Works
A typical token vault flow looks like this:
– A user enters card details in a secure payment form (hosted by the gateway or terminal)
– The payment provider converts the card data into a token
– The token is stored in the provider’s vault and returned to the charging platform
– Future transactions use the token to charge the customer without exposing card details
– The vault enforces access controls, encryption, and audit logging around token use
Tokens can be single-use or reusable, depending on the payment provider and use case.
Where Token Vaults Are Used in EV Charging
Token vaults commonly support:
– App-based card payments for pay-as-you-go charging
– Fleet and corporate accounts with postpaid billing
– Subscription charging plans and membership renewals
– Pre-authorizations and final capture workflows
– Refunds and partial reversals
– Multi-tenant billing where payment methods are stored per account
For tap-to-pay, the tokenization may happen through the payment terminal and processor, with the backend receiving transaction references rather than raw card details.
Token Vault vs Stored Card Data
A key distinction:
– Stored card data means storing real PAN/card details (high risk, high compliance burden)
– Token vaulting stores tokens that reference card details securely held by the payment provider (lower exposure)
Token vaulting does not eliminate all compliance needs, but it usually reduces risk and simplifies system architecture.
Operational Considerations
– Token lifecycle management (updates on expired/replaced cards, retries)
– Linking tokens to users, fleets, or tenant accounts correctly
– Strong authentication and access controls to prevent misuse of tokens
– Clear processes for refunds and dispute handling
– Data retention and deletion rules to meet privacy requirements
– Provider dependency: token portability between payment providers can be limited
Common Pitfalls
– Assuming token vaulting removes all PCI DSS obligations (scope is reduced, not always eliminated)
– Weak account security that allows attackers to use stored tokens
– Poor token mapping leading to billing errors or tenant disputes
– Vendor lock-in due to token non-portability across gateways
– Insufficient audit logs around token use and payment events
Best Practices
– Use a reputable payment provider with strong tokenization and compliance controls
– Prefer hosted payment pages/terminal flows to keep card data out of your systems
– Implement role-based access and audit trails for token operations
– Monitor payment failures and automate retry logic where appropriate
– Design for provider changes: abstract token usage behind a payment service layer
Related Glossary Terms
Payment Gateway Integration
Payment Terminals
Tap-to-pay
PCI DSS
Merchant Accounts
Subscription Charging Plans
Postpaid Charging
Invoice Automation