Nitpick - for consistency in the codebase please use single line for MakeRequests function declaration.

func (a *adapter) MakeRequests(openRTBRequest *openrtb2.BidRequest, _ *adapters.ExtraRequestInfo) (requestsToBidder []*adapters.RequestData, errs []error) {
//your code
}

Sure. Done.

nitpick - you could combine the above if statement and simply return publisherID, errors.New("no publisherID supplied")

Not sure this solution will work. Due to your code, err is initialised, and the caller will handle err properly:

	publisherID, err := a.extractPublisherID(openRTBRequest)
	if err != nil {
		errs = append(errs, fmt.Errorf("extractPublisherID: %w", err))
		return nil, errs
	}

I updated code a bit. Please check.

you should not ignore Unmarshal error here. Please do the error handling properly.

if err := json.Unmarshal(imp.Ext, &bidderExt); err != nil {
     return "", err
}

Sure, updated.

same comment as above. Please do not ignore Unmarshaling error here.

sure, updated.

Requesting you to please move this to single line for consistency across the codebase.

sure, done.

Checking response status code this way is correct but you could also make use of the following code -

if httputil.IsResponseStatusCodeNoContent(response) {
		return nil, nil
	}

	if err := httputil.CheckResponseStatusCodeForErrors(response); err != nil {
		return nil, []error{err}
	}

sure, updated.

Warning - This is an anti-pattern. This code assumes that for multi-format bid request, mediatype will be set to type banner by default. I would recommend to set the mediaType based on bidder response. Your bidder should be able to set openrtb2.Bid.Mtype field and use that field here to get mediaTypeForImp. Even if your bidder does not support multi-format request, I would highly encourage you to make this change. Here is an example.

sure, updated.

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email verified. thanks!

User sync URL works. 👍

In rise.yaml, you have defined that your bidder will be supporting just Banner and Video. I believe you might wanna error out if bidder response returns Audio or Native as bid type. So here is the code -

switch bid.MType {
	case openrtb2.MarkupBanner:
		return openrtb_ext.BidTypeBanner, nil
	case openrtb2.MarkupVideo:
		return openrtb_ext.BidTypeVideo, nil
	default:
                 return "", fmt.Errorf("unsupported MType %d", bid.MType)

sure, updated