You can request your consumer score directly from Sift.
There's an online form to check whether you're in Zeta Global's database.
You can fill out the online form here. According to The New York Times, only about 10 people had requested their file from Zeta Global as of November.
You can obtain your report from the Retail Equation by emailing the company directly.
You can check whether Riskified thinks you might be a fraud by emailing the company directly.
You can email Kustomer to see what information it has on you.
If a company isn't cooperating with your request, be persistent.
Companies that do business in California — essentially every tech company — will be obligated to adhere to the new law starting in 2020, so you're legally entitled to a copy of your file.