Resumes a subscription that is pending cancellation or is already canceled.

If the subscription is in a CANCELED state:

• An immediate charge for the subscription amount will be trigered.
• If the charge is unsuccessful, the subscription will be moved to PASTDUE status until a charge is successful.
• If all charge retry attempts fail, the subscription will be become CANCELED once again. If the subscription is in the PENDING cancellation state:
• The existing billing cycle will remain in place