add optional param to bridgewellBidAdapter

[wuleo]

Type of change

• Feature
• Does this change affect user-facing APIs or examples documented on http://prebid.org?

Description of change

Add parameter cpmWeight that allows publisher to alter (scale) bid prices from Bridgewell.

• contact email of the adapter’s maintainer: leowu@bridgewell.com

[jsnellbaker]

Hello @wuleo ,

Overall this PR looks good, however I did see one thing that should be altered. Can you please make the change when you get the chance?

Just to mention, I had some difficulty initially testing out the changes with the hello_world page using the test params in the updated md file. It turns out the base CPM for the test ad ($0.17) coupled with the 0.5 cpmWeight was causing the recalculated cpm to be below $0.10 - which was causing it to fall to the bottom tier price bucket which only had house ads.

Once I raised the cpmWeight setting (to 0.75 as an example), I was consistently seeing the test ad fine. Perhaps it would be ideal to adjust the test value in the md file?

Thanks.

[jsnellbaker]

Can remove this duplicate line.

[wuleo]

Some publishers in Taiwan may use this optional cpmWeight to prefer or not prefer Bridgewell’s bid price.
For instance, if a publisher set cpmWeight 0.5, this means they don’t want to prefer Bridgewell, they scale down Bridgewell’s bid price to 50% i.e. 0.5*(Bridgewell’s bid price).
In the other hand, if they set cpmWeight 1.5, it means they want to scale up Bridgewell’s bid price 50%, i.e. 1.5*(Bridgewell’s bid price).

[jsnellbaker]

@wuleo That's fine, it'll be up to the publisher to set the value that makes sense given their needs. I just wanted to comment on test params data in case it needs to be tested later on without difficulty. The changes look good now so I'll merge them in.

[wuleo]

Thanks for the review. Very appreciate your effort.