The Customer Success Manager initially validates stakeholders during the onboarding stage34. This is a critical phase where the CSM establishes relationships with key stakeholders, understands their expectations, and begins to align the product's capabilities with the customer's business objectives.

The Customer Success Manager identifies the solution purchased during the Purchase stage of the lifecycle.
This is when the transaction is completed, and the details of the purchase are finalized, including the specific solutions that the customer has bought. References: The lifecycle stages of customer engagement typically include the Purchase stage as a key phase where the details of the transaction are recorded and acknowledged.