paid_ads-8.x-1.x-dev/config/schema/paid_ads.settings.schema.yml

paid_ads.settings:
  type: config_object
  label: 'Module Settings'
  mapping:
    paypal_gateway:
      type: mapping
      label: 'Gateway settings'
      mapping:
        mode:
          type: string
          label: 'Mode'
        client_id:
          type: string
          label: 'Client Id'
        secret_id:
          type: string
          label: 'Secret Id'