To migrate active subscriptions into Revenue Cloud, the subscriptions must be represented as Asset records. The standard and correct procedure for this "assetization" is to first create Order and Order Item records that reflect the current state of the existing subscriptions. Once the data is staged as Order Items, the Create or Update Asset From Order Item Action API is invoked. This API is specifically designed to take an Order Item and generate the corresponding Asset, which Revenue Cloud then uses to manage the subscription's lifecycle, including future amendments, renewals, and cancellations.

B. The Place Sales Transaction API is a composite API designed to process an entire new sales event from an external system, not for the specific task of migrating existing subscription data into assets.

C. The Initiate Amendment Action API is used to begin the amendment process for an existing Asset. It cannot be used to create the initial Asset during a data migration.

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1. Salesforce Subscription Management Developer Guide, "Asset Lifecycle Management APIs": This guide details the APIs for managing assets. It specifies that the Create or Update Asset From Order Item action is the mechanism to "create an asset from an order item or update an existing asset with details from an order item." This directly supports the process of converting a staged order line into an asset for migration.

Reference: Salesforce Help, Subscription Management Developer Guide, Section: "Actions for Asset Lifecycle Management", Action: Create or Update Asset From Order Item.

2. Salesforce Subscription Management Implementation Guide, "Data Migration Considerations": This guide outlines the strategy for migrating data into Subscription Management. It explicitly states the required flow: "To migrate subscriptions, create order products that represent the subscriptions, and then create assets from the order products." This confirms the two-step process described in the correct answer.

Reference: Salesforce Help, Subscription Management Implementation Guide, Section: "Migrate Your Data", Subsection: "Data Migration Strategy".

3. Salesforce Connect REST API Developer Guide, "Asset Management Actions": The API documentation provides the technical specification for the createUpdateAssetFromOrderItem action, confirming its role in the assetization process from an order item, which is the foundational step for representing a subscription in Revenue Cloud.

Reference: Salesforce Developer Documentation, Connect REST API Developer Guide, Section: "Asset Management Actions", Resource: /asset-management/assets/order-items.