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Go to App Settings → Custom Types.
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Select Currency or Sender Id from the left-hand list.
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Click + Add Currency (or the equivalent for Sender Id).
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Fill in the Name and, optionally, a Description.
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Click Create.

💡 Tip — A new Sender Id starts with an Approval status of Pending until it's approved — see Managing Custom Types for editing, archiving, and deleting existing entries.