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Installments API v3

📄️ Update Plan By Alternate Field

Locate a plan by `RefOrderNumber` or `ExtendedParams` then carry out post-authorization activities related to the plan, such as updating the order number, updating the tracking number, updating shipping status or updating the amount of the plan (if it hasn't been captured yet). You can also use this endpoint to capture the first installment from a plan that has only been authorized but not yet captured. Note that `RefOrderNumber` or `ExtendedParams` were optionally specified by you upon plan creation.