In the podcasting industry, referral codes are used specifically so that advertisers can figure out how many conversions are coming from the podcast
The old-school method of this was to have unique response numbers. It's why you see phone numbers like "800-555-1212 extension 37." When you call the number and ask for extension 37, the person on the horn says, "Yes, this is extension 37..." and begins their pitch while noting that affiliate 37 gets the conversion credit.
It's similar to TV commercials you see that tell you to "Go to example.com/TV37."
Some lead generators are willing to splash out extra money on specific phone numbers without extensions because they believe they convert better. It's why toll free phone numbers expanded so rapidly from just 800 and 888 to 877, 866, 855, and 844.
The old-school method of this was to have unique response numbers. It's why you see phone numbers like "800-555-1212 extension 37." When you call the number and ask for extension 37, the person on the horn says, "Yes, this is extension 37..." and begins their pitch while noting that affiliate 37 gets the conversion credit.
It's similar to TV commercials you see that tell you to "Go to example.com/TV37."
Some lead generators are willing to splash out extra money on specific phone numbers without extensions because they believe they convert better. It's why toll free phone numbers expanded so rapidly from just 800 and 888 to 877, 866, 855, and 844.