webhooks-8.x-1.x-dev/modules/webhook/config/schema/webhook.schema.yml

webhook.settings:
  type: config_object
  label: 'Webhooks settings'
  mapping:
    create_webhook_types:
      type: boolean
      label: 'Create Webhook types'
webhook.mappings.*:
  type: config_object
  label: 'Field payload mapping'
  mapping:
    mapping:
      type: sequence
      label: 'Mapping'
      orderby: key
      sequence:
        type: string
        label: 'Field mapping'