commerce-8.x-2.8/modules/checkout/config/schema/commerce_checkout.schema.yml

commerce_order.commerce_order_type.*.third_party.commerce_checkout:
  type: mapping
  label: 'Checkout settings'
  mapping:
    checkout_flow:
      type: string
      label: 'Checkout flow'

commerce_checkout.commerce_checkout_flow.*:
  type: config_entity
  label: 'Checkout flow'
  mapping:
    label:
      type: label
      label: 'Label'
    id:
      type: string
      label: 'Machine-readable name'
    plugin:
      type: string
      label: 'Plugin'
    configuration:
      type: commerce_checkout.commerce_checkout_flow.plugin.[%parent.plugin]

commerce_checkout.commerce_checkout_flow.plugin.*:
  type: mapping
  mapping:
    display_checkout_progress:
      type: boolean
      label: 'Display checkout progress'

commerce_checkout.commerce_checkout_flow.plugin.multistep_default:
  type: commerce_checkout_flow_with_panes_configuration

commerce_checkout_flow_with_panes_configuration:
  type: mapping
  mapping:
    display_checkout_progress:
      type: boolean
      label: 'Display checkout progress'
    order_summary_view:
      type: string
      label: 'Order summary view'
    panes:
      type: sequence
      label: 'Panes'
      sequence:
        type: commerce_checkout.commerce_checkout_pane.[%key]

commerce_checkout.commerce_checkout_pane.*:
  type: commerce_checkout_pane_configuration

commerce_checkout.commerce_checkout_pane.contact_information:
  type: commerce_checkout_pane_configuration
  mapping:
    double_entry:
      type: boolean
      label: 'Require double entry of email'

commerce_checkout.commerce_checkout_pane.login:
  type: commerce_checkout_pane_configuration
  mapping:
    allow_guest_checkout:
      type: boolean
      label: 'Allow guest checkout'
    allow_registration:
      type: boolean
      label: 'Allow registration'

commerce_checkout.commerce_checkout_pane.order_summary:
  type: commerce_checkout_pane_configuration
  mapping:
    view:
      type: string
      label: 'View'

commerce_checkout_pane_configuration:
  type: mapping
  mapping:
    step:
      type: string
      label: 'Step'
    weight:
      type: integer
      label: 'Weight'