So I made a custom model:

@api.model
class StockApi(models.Model):    
    _name = "stock.api"

    def get_lot_info(self, vals):              
      return  "hi"

When  I  try  to  access  it  through  external  APIs,  with  python  it  works,
but  with  PHP  it  doesn't.  With  python  I  get  "hi",  with  PHP  I  get
'faultCode' => 2,  'faultString' => 'Object stock.api doesn\'t exist'.
I  am  using  ripcord,  and  I  set  up  everything  according  to  the  tutorials,
in  both  cases.
With  other  models,  PHP  also  works.

What  could  be  the  possible  problem?