Using the Interactive REST API Reference {#rb-subs-migration-4-dev-ctr-api}
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After exporting subscription data from your current provider in [Task 3: Export Current Subscriptions to a File](/docs/cybs/en-us/recurring-billing/migration/all/rest/recurring-billing-migrate/rb-subs-migration-3-export.md ""), write a subscription creation script that accesses entries in your export file and recreates each subscription within Cybersource Recurring Billing.  
The `Cybersource` Developer Center includes an interactive *REST API Reference*. As you write your script, you can use the interactive module to help construct request messages for creating Recurring Billing plans and subscriptions.