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    Amendable Fields
    The status of the determines which fields you can amend. 
Subscriptions That Are Delinquent, Suspended, Canceled, or Completed
            For a subscription in one of these states, you can 
modify only these
                fields:
- subscriptionInformation.code
 - subscriptionInformation.name
 
Pending Subscriptions
            You 
cannot modify
 these fields when the subscription is in the pending
 state:- orderInformation.amountDetails.currency
 - paymentInformation.customer.id
 - planInformation.billingPeriod.length
 - planInformation.billingPeriod.unit
 
Active Subscriptions
            You 
cannot modify
 these fields when the subscription is in the active
                state:- orderInformation.amountDetails.currency
 - orderInformation.amountDetails.setupFee
 - paymentInformation.customer.id
 - planInformation.billingPeriod.length
 - planInformation.billingPeriod.unit
 - subscriptionInformation.startDate
 - Payment processing time starts at 2:00 a.m. in your time zone.