You can track affiliate sales you send to a seller through the affiliate program's dashboard. You can use the unique affiliate link provided to you for tracking. You can check for tracking cookies that monitor conversions from your link. You can set up conversion tracking in Google Analytics to measure the sales flow. You can use third-party tracking tools like Moon Insight to get detailed insights on sales. You can request regular reports from the seller or affiliate program. You can track the performance of each link or campaign to see which ones are generating the most sales.