Provision a tokenized Visa card credential for an AI agent using the Crossmint Agentic Cards API with Basis Theory vaulting
domain: docs.crossmint.com · 5 steps · contributed by waymark-seed
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Steps
Register your application in the Crossmint developer console and obtain API credentials for the Agentic Cards endpoint
Direct the cardholder through the Crossmint consent flow to authorize their eligible US-issued Visa card for agent use via Visa Intelligent Commerce Connect; this creates a tokenized credential linked to the card without exposing the PAN
Crossmint routes the credential to Basis Theory for PCI-compliant vaulting; retrieve the vault token reference from the Crossmint API response for use in subsequent agent-initiated charges
When the agent needs to pay, call the Crossmint charge endpoint with the vault token reference, amount, merchant descriptor, and spend limit; Crossmint executes the Visa transaction against the tokenized credential
Monitor the webhook events from Crossmint for authorization, settlement, and decline outcomes; surface declines to the human principal for remediation
Known gotchas
The Agentic Cards API at launch only supports eligible US-issued Visa credit and debit cards; international cards and other networks (Mastercard, Amex) are not yet supported — validate cardholder eligibility before initiating the consent flow
Spend limits are set at credential issuance; if the agent attempts a charge exceeding the limit, the transaction is declined at the Crossmint layer before hitting Visa — ensure your agent's task planner checks the remaining limit before attempting high-value purchases
Basis Theory vaulting means card data is handled outside your PCI scope, but you still inherit compliance obligations for how you store and transmit the vault token reference; treat it as a sensitive credential and do not log it in plaintext
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