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To use Fenix branded tracking pages, brands need to provide the order data and the tracking numbers in Fenix format. We already have this pre-built for brands using the Shopify platform and can get the data using Shopify webhooks. For non-Shopify brands, here is the documentation to provide Order data to Fenix: Order and Fulfillment API
Retailers should provide carrier credentials to pull the tracking events for each tracking id.