"Not Started" means that a payer created a recurring plan but the first payment doesn't occur until a future date.
"Active" means that a plan has already had at least one successful payment and is scheduled for future payments.
"Past Due" means that there was a failed payment on a plan but that the payer's card will be retried.
"Canceled" means that no further payments will be attempted on a payer's card.
"Expired" means that the plan had a defined duration and it has now reached its expiration date.
“Pending” can have multiple meanings: 1) It can mean that a canceled plan was restarted and the restart date for the first payment was set for a future date. 2) It can mean that the recurring day for an active plan was reset to a date different than the original recurring day. 3) It can mean that the first payment after the initial checkout hasn’t occurred yet because the start day was set for the future 4) It can mean that there was a trial period set for the recurring plan when the payer first checked out and the first payment hasn't occurred yet.