Shippex.Carrier.create_transaction

You're seeing just the callback create_transaction, go back to Shippex.Carrier module for more information.
Link to this callback

create_transaction(arg1, arg2)

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Specs

create_transaction(Shippex.Shipment.t(), atom() | Shippex.Service.t()) ::
  {atom(), Shippex.Transaction.t() | map()}