The parameters of a single payment, whether created individually or as part of a recurring subscription, cannot be edited once created in GoCardless. Instead, you will need to cancel the payment and create a new one with your updated parameters.
You are, however, able to add an internal reference to a payment in your dashboard at any time, irrespective of its status.
Follow these steps to add a custom reference to an existing payment
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Locate the payment in your dashboard and open its individual record
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Click on the three dots in the top right corner and then click edit payment
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Enter the name and value of the reference (you can add up to three references)
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Click Update payment
The reference will appear within the Details section of the payment record.