> ## Documentation Index
> Fetch the complete documentation index at: https://apidocs.seismic-cards.systems/llms.txt
> Use this file to discover all available pages before exploring further.

# Update a cardholder



## OpenAPI

````yaml /openapi.json patch /v1/cardholders/{id}
openapi: 3.1.0
info:
  title: Seismic Card Issuance API
  version: 1.0.0
  description: >-
    The Seismic Card Issuance API is the integration surface for issuing and
    managing cards. Authenticate with your Seismic API key, onboard applicants,
    run KYC, and issue virtual or physical cards — all through one white-labeled
    API.
  contact:
    name: Seismic Support
    url: https://seismic.systems
servers:
  - url: https://api.seismic-cards.systems
    description: Production
  - url: http://localhost:4000
    description: Local development
security:
  - bearerAuth: []
tags:
  - name: Authentication
    description: Exchange Seismic API keys for a short-lived access token.
  - name: Applicants
    description: End-users and businesses, plus their identity verification (KYC).
  - name: KYC
    description: >-
      Identity verification settings, hosted sessions, BYOK share tokens, and
      issuer readiness.
    x-group: Identity verification (KYC)
  - name: Accounts
    description: Funding accounts that back issued cards.
  - name: Cardholders
    description: Approved applicants turned into cardholders.
  - name: Cards
    description: Issue and manage virtual and physical cards.
  - name: Transactions
    description: Card transaction history from the issuer or local ledger.
  - name: Widget SDK
    description: >-
      Public Seismic-hosted Widget.js for Method 1 card reveal (no auth).
      PAN/CVV render inside PCI iframes.
  - name: Card funding
    description: >-
      Fund prepaid cards with stablecoins: Seismic wallet service or
      bring-your-own (BYO) external wallet.
paths:
  /v1/cardholders/{id}:
    patch:
      tags:
        - Cardholders
      summary: Update a cardholder
      operationId: updateCardholdersById
      parameters:
        - $ref: '#/components/parameters/IdPath'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                display_name:
                  type: string
                email:
                  type: string
                phone:
                  type: string
                phone_country_code:
                  type: string
      responses:
        '200':
          description: Updated cardholder.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/Cardholder'
components:
  parameters:
    IdPath:
      name: id
      in: path
      required: true
      schema:
        type: string
      description: Resource identifier.
  schemas:
    Cardholder:
      type: object
      properties:
        id:
          type: string
        applicantId:
          type: string
        displayName:
          type: string
        createdAt:
          type: string
          format: date-time
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        Bearer access token obtained from `POST /v1/oauth/token` using your
        Seismic API key.

````