Target specific placements with bid only

Hi.

I would like to place bids (CPC bid) for specific placements and not to target only them (the adgroup will have a default bid for all others). This is at the Display network.

How can I do this? What values should I place to what fields at the adgroup and at the adgroup criterion?

For now I have tried the mutate method with:

[{

                'operator': 'ADD',

                'operand': {

                    'xsi_type': 'BiddableAdGroupCriterion',

                    'adGroupId': ------- SOME ID -------,

                    'criterion': {

                        'xsi_type': 'Placement',

                        'url': '----- SOME URL ------'

                    },

                    'biddingStrategyConfiguration': {

                        'bids': [

                            {

                                'xsi_type': 'CpcBid',

                                'cpcBidSource': 'CRITERION',

                                'bid': {

                                    'microAmount': ----- SOME BID ------

                                }

                            }

                        ]

                    },

                    'criterionUse': 'BIDDABLE'

                }

            }]

But that makes the adgroup to target only this url.

Thanks in advance.

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