FLEDGE/PAAPI module's adUnit level config requirement needs lots of changes on publisher side

[pm-harshad-mane]

Type of issue

Fledge Module requires Module level config, bidder level config and slot level config too.
Refer: https://github.com/prebid/Prebid.js/blob/master/modules/fledgeForGpt.md

Module level and bidder level config can be easily applied with less effort.
But publishers will need to make changes for each slot to enable the Fledge/PAAPI on each slot.

Example to enable the Fledge on slot

pbjs.addAdUnits({
    code: "my-adunit-div",
    // other config here
    ortb2Imp: {
        ext: {
            ae: 1
        }
    }
});

The documentation says, Absence indicates this is not FLEDGE eligible.

My suggestion is to set the default value of ae flag to 1 at the slot level internally through the Fledge module, we should not set the flag to 1 if the user has explicitly set it 0.

This will avoid the publisher's efforts for modifying all slot-level configs on the setup.
The overall fledge flow will execute only if the module is included and enabled (module and bidder config) by the publisher.

[patmmccann]

Perhaps we could consolidate further? eg

pbjs.que.push(function() {
  pbjs.setConfig({
    fledgeForGpt: {
      enabled: true,
      bidders: ['a','b'],
      defaultForSlots: 1
    }
  });
});

[pm-harshad-mane]

yes @patmmccann, this approach also works.

[patmmccann]

@pm-harshad-mane committee agrees this is ready for dev; Pubmatic (or anyone) is welcome to pick it up or prebid could pick it up after a bunch on consent related work in the queue. Let us know if you guys begin development

[laurb9]

I (openx) can take a stab at implementing this

[laurb9]

To confirm, the expected effect of the config statement above is: only bidders "a" and "b" are enabled for FLEDGE, all adUnits/imps set imp.ext.ae=1 for these bidders if not explicitly set individually ?

Should we take the absence of bidders property in fledgeForGpt to mean all bidders ?
What about bidders: [], could be no bidders or all bidders ? It can be overridden per-bidder with setBidderConfig.