Concrete type for Transaction

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Currently, client methods like PaystackClient.transactions.getTransactions, return a PaystackResponse whose data may be a record or an array of records leaving consumers of this package to have to infer in implement types in their project. implement a Transaction type so that client methods like PaystackClient.transactions.getTransactions may return PaystackResponse<Transaction[]> and PaystackClient.transactions.getTransaction may return PaystackResponse<Transaction>.

Prerequisites

• a paystack account (to obtain a secret key)
• using the paystack-cli to obtain a dump of transactions to determine fields and their types. See project documentation for more
• depend on Convert PaystackResponse to a generic type #34