Concrete type for PaymentPage

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Currently, client methods like PaystackClient.paymentPages.getPages, 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 PaymentPage type so that client methods like PaystackClient.paymentPages.getPages may return PaystackResponse<PaymentPage[]> and PaystackClient.paymentPages.getPage may return PaystackResponse<PaymentPage>.

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