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    Creating a Follow on Subscription from an Existing Transaction
    You can create a subscription using an existing successful transaction by specifying its
                request ID in the path. This method eliminates the need to provide a customer
                token.
You can use an existing or one-time plan.
The start date must be in coordinated universal time (UTC) in this format:
                YYYY-MM-DDThh:mm:ssZ. The T separates the date and the time. The Z indicates UTC.
                For example, 
2023-08-11T22:47:57Z
 indicates August 11, 2023, at
                22:47:57 (10:47:57 p.m.).
                For subscriptions created on the start date, set the
                time to the current time and day in your time zone.Follow these steps to create a subscription:
- Create the request with the required API fields.
 - Send the request to one of these endpoints:
 - Verify the responses to make sure that the request was successful. A 200-level HTTP response code indicates success.
 
Required Fields
    These fields are required for creating a subscription from an existing
                transaction:
- subscriptionInformation.name
 - subscriptionInformation.startDate
 
This field is required for using an existing plan:
- subscriptionInformation.planId
 
These fields are required for using a one-time plan:
- orderInformation.amountDetails.billingAmount
 - orderInformation.amountDetails.currency
 - orderInformation.amountDetails.setupFee
 - planInformation.billingPeriod.length
 - planInformation.billingPeriod.unit
 
REST Example: Creating a Follow on Subscription from an Existing Transaction
    This example shows how to create a follow on subscription from an existing
        transaction.
Request
{ "subscriptionInformation": { "planId":"1619214515", "name": "SubNameFOOTPTesting", "startDate": "2023-04-15T17:01:42Z" } }
Example Response to a Successful Request
{ "_links": { "self": { "href": "/rbs/v1/subscriptions/1619214861", "method": "GET" }, "update": { "href": "/rbs/v1/subscriptions/1619214861", "method": "PATCH" }, "cancel": { "href": "/rbs/v1/subscriptions/1619214861/cancel", "method": "POST" } }, "id": "1619214861", "status": "COMPLETED", "subscriptionInformation": { "code": "AWC-49", "status": "PENDING" } }
Example Response to a Failed Request
{ "status": "NOT_FOUND", "reason": "INVALID_DATA" }