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Once a plan is assigned to a customer, you can edit the subscription, whether it is pending or active:
A subscription held incomplete by an activation rule cannot be edited, upgraded or downgraded until it activates or is canceled.
  1. Click the three dots menu icon and select “Edit subscription”;
  2. Subscription start date
    You can modify the subscription start date if the subscription is pending and the chosen date is later than today. See the guidelines for subscription start date;
  3. Subscription end date
    You can also change the subscription end date. See the guidelines for subscription end date; and
  4. You can edit any prices listed for a subscription, including charges, commitments, tiers and spending minimums.
  5. In Invoicing settings, you can change the subscription’s payment term or restore inheritance from the customer.
Fixed charges are updated under plan_overrides, using the fixed_charges array. Sending only units (and apply_units_immediately if needed) updates the quantity without creating a plan override. Passing a price or properties creates one. See Update a fixed charge via the API.

Change payment terms

On the subscription overview, the current term appears under Invoicing settings, with an inheritance hint when the subscription has none of its own. Click Edit, choose the payment-term type and its days or month settings, then save. To return to the customer’s default, choose the inheritance option. See Payment terms for the available options and examples. For example, change a subscription from Net 30 to Net 60 after negotiating a longer payment window. A new invoice dated April 10, 2026 is due June 9 instead of May 10. The customer’s other subscriptions keep their own or inherited terms. Existing invoices, including drafts, keep the payment term they were created with. Different effective terms also affect whether subscriptions can share an invoice.