Card issuing overview

Your Sigil, on a Visa card. A is the user’s verified identity; card issuing is how that identity becomes a card you can spend with. The card carries the user’s rules, limits, and agent permissions everywhere it goes — the same authorisation that governs the rest of their Sumvin life, on a piece of plastic and a tap. Sumvin is a launch partner on Visa Intelligent Commerce — the rails built for agents that pay.

Why this exists

Card-network rails — issuance, PAN delivery, transaction streams — are not something a partner integrates against directly. Sumvin holds the user binding to their Sigil, the lifecycle state machine, and the on-chain wallet that backs spend, then exposes a single API for partners to drive the card forward. End-to-end issuance through the network runs over the Visa issuance partner rail; the surface partners build against today is the lifecycle management layer and the funding wallet that backs it.

The pieces

Piece	What it is	Status
Card Management API	List, get, freeze, unfreeze, report lost, report stolen, activate. The state machine for an issued card.	Live
Funding wallets	The Safe smart account on the card’s chain. Value in the wallet is what the card draws on.	Live
Visa card issuance	The rail that turns a Sumvin card record into a spendable Visa card. Network-side provisioning runs through the Visa issuance partner.	Private preview

The Card Management API and funding wallets are live today. End-to-end Visa card issuance is in private preview: network-side provisioning runs through the Visa issuance partner rail, and partners lining up now help shape the issuance spec and secure a place in the launch cohort. Contact your account manager to scope your rollout.

How a card composes

┌────────────────────────┐
│ Card                   │   id, last_four, brand, exp, state
│  external_id           │
│  linked_wallet_id ─────┼───┐
│  status (state machine)│   │
└────────────────────────┘   │
                             ▼
              ┌────────────────────────┐
              │ Funding wallet         │   Safe smart account
              │  address (0x…)         │   on the card's chain
              │  chain_id              │
              └────────────────────────┘
                             │
                             ▼
              ┌────────────────────────┐
              │ Safe on Sei            │   Sei is the launch chain
              │  EIP-1271 verification │   (chain ID 1329)
              │  Agent-signed actions  │
              └────────────────────────┘

The card record carries identifying metadata and a state, bound to the user’s Sigil. The funding wallet is a Safe smart account on the card’s chain — there is no credit line, so balance in the wallet is what authorises a transaction.

Where to start

Concern	Where to go	When
Card lifecycle	Card management API	Freeze, unfreeze, report lost or stolen, activate
Funding wallet	Funding wallets	When the card needs balance to authorise a transaction
Conceptual model	Card issuing concept	Before integrating — read this first
Reference app	Crypto wallet card	If you’re building the consumer surface this unlocks

Sigil — the verified identity the card is bound to.
Issue a card quickstart
Safes and identity
Funding wallet (glossary)
Visa card issuance — private preview

Introduction

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Card issuing overview

Why this exists

The pieces

How a card composes

Where to start

​Why this exists

​The pieces

​How a card composes

​Where to start

​Related

Why this exists

The pieces

How a card composes

Where to start

Related