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I would like to know which source / affiliate link are responsible for a goal conversion. In Google Analytics, I tried Conversions > Goals > Reverse goal path.
But unfortunately, all I see is that people who have a goal conversion (= visiting successful payment page example.com/payment) come on my site with this URL:
/
This doesn't inform me if they come from /?src=blog1 or /?src=blog23, etc.
How to find this more precise information in the reverse goal path?
In Google Analytics Reports there are many ways to find out where a visitor/conversion has come from.
Reports
1) Conversions > Goals > Overview > Source/Medium
Here Source/Medium represents your Blog-1/Referral conversions. You can check each goal or conversion individually using the dropdown menu at the top.
2) Acquisition > All Traffic > Referrals
You will be able to see all the referrals in this report in a table listed, and you can also select the goal-conversion you wish to track
Custom Campaigns
This is a great way to track your visitors/referrals, you can be more specific as to from where does the visitor visited your website, what link the visitor clicked on and from what page. Mage sure to use the parameters wisely and use the name of your BLOGs as the utm_source to keep it tidy. Note: Of course, the only condition here is that you have to have access to all the referral blogs to edit the links.
Here is the link to get you started, there are plenty of tutorials online.
Advance Segments
You can also follow this tutorial to create advance segments for measuring your referral traffic coming from specific domains/blogs. Then use this segment across all your GA reports and goal/conversion reports to compare the referrals campaign impact vs all the website traffic or other segments.
Please note that the tutorial will walk you through how to create an advance segment with social media channels, apply the same procedure with your domains/blogs you wish to track.
Custom Dimensions and metrics
Adwords campaigns allow you to setup custom URL parameters. In Google analytics, as far as I know, you should be using the standard implementation using "Custom Campaigns" if you have the access to edit the links.
However you could use custom dimensions and pre-process those URLs in your website and generate a javascript that will send your custom events or set your custom dimensions. So for example, a visitor lands in your website/page/?source you website process document.location and push the notification to GA via custom dimensions/metrics. Or (I never tried this) read the visitor browser history using window.history redirect to the proper page and push the custom GA event/dimension.
?utm_source=..., etc.), shame on me! Because I used ?source=... nothing is displayed in source/medium. I'll do better for next links, I'll respect the standard!
In addition to the accepted answer, here is the idea: if you want to use Google Analytics, don't use ?source= or such home-customised parameters, but just use the Google standard ?utm_source=... It finally makes life easier when using Analytics because everything is detected correctly out of the box.
As some of external referral links to my website didn't use this standard, I finally used some Javascript code to detect ?source= in the URL and then trigger a pageview with the right source / medium / campaign with this : https://stackoverflow.com/questions/45645656/how-to-send-medium-and-source-with-gasend-pageview