Add buyer data to Index Exchange bid responses

[kelvin-chappell]

Type of change

• Feature

Description of change

Adds buyer data to Index Exchange responses, following the format specified in #3115.
We have already made this change to our fork, here.

• test parameters for validating bids

{
  bidder: '<bidder name>',
  params: {
    // ...
  }
}

Be sure to test the integration with your adserver using the Hello World sample page.

• contact email of the adapter’s maintainer
• official adapter submission

For any changes that affect user-facing APIs or example code documented on http://prebid.org, please provide:

• A link to a PR on the docs repo at https://github.com/prebid/prebid.github.io/

Other information

/cc @ix-prebid-support

[kelvin-chappell]

The circleci test failure doesn't appear to be caused by this PR, as far as I can tell.

[mkendall07]

you might need to rebase on master to fix the circle CI error.

[mkendall07]

@ix-prebid-support @indexexchange ping

[ix-prebid-support]

@mkendall07 This looks good to merge into the next release. One observation is that it doesn't appear that these ext params make the Prebid Server response. This would prevent the data from reaching the analytics module for Ozone. Has this been tested and are there any concerns here?

cc @kelvin-chappell

[kelvin-chappell]

@ix-prebid-support This PR is purely to make buyer data available to the client-side adapter. It's only been tested in that context. I haven't considered what changes would be required to support analytics in Ozone as that isn't in the scope of the PR.

[ix-prebid-support]

@kelvin-chappell Understood, and appreciate the quick clarification.

[mkendall07]

LGTM. Thanks everyone for their input.