OSI accounts purchased from Shopify App Store are linked automatically and would not require integration for sales to be tracked by the software. In addition, you may enable the Auto Promo Code feature wherein affiliates who sign up will be assigned their own promo code that they may use to promote your products. Affiliates may also edit their promo code which will sync with your Shopify.
eCommerce SEO videos and resources:
Free Videos: https://www.osiaffiliate.com/ecommerce-resources/
OSI Affiliate Software: https://www.osiaffiliate.com
eCommerce Marketing Podcast: https://www.ecommercemarketingpodcast.com