old_contents: from ..base import ShopifyResource
  from shopify import mixins
  
  
  class Balance(ShopifyResource, mixins.Metafields):
      _prefix_source = "/shopify_payments/"
  
new_contents: from ..base import ShopifyResource
  from shopify import mixins
  
  
  class Balance(ShopifyResource, mixins.Metafields):
      _prefix_source = "/shopify_payments/"
      _singular = _plural = 'balance'
  
subject: Add pluralized endpoint for balance