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The below authentication in all the flows related to the billing API is handled by the client backend app in same way above.
This guide explains the flow for authentication and retrieving billing plans using the Billing SDK.

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Get Plans Flow

Billing Setup Flow
You can use the useBillingPlans hook to retrieve the plans and entitlements.
1

Client UI Initiates Request

The client UI calls the useBillingPlans hook to trigger a call to the billing API.
2

Billing API Validates Session

The billing API queries the client backend app to check the validity of the session and retrieve user details.
3

Return error to client if session is not valid

If the session is not valid, the billing API will return an error to the client UI.
4

Billing API Queries Lago

If session is valid then based on the user details, the billing API queries Lago to return the plans for the user. Currently, all plans are fixed for each client.
5

Lago Returns Plans

Lago returns the relevant plans to the billing API.
6

Billing API Responds to Client

The billing API forwards the plans back to the client UI. The useBillingPlans hook receives the response, which includes the plans and any potential errors.
You can use the useBillingPlans hook to retrieve the plans and entitlements.