Interface conflicts for the metadata #111

The metadata in the PaystackProps has conflicting interfaces for the metadata field, this flags type when defining custom meta data fields. Please have this checked.

interface PaystackCustomFields { display_name: string; variable_name: string; value: any; } interface PaystackMetadata { custom_fields: PaystackCustomFields[]; } interface PaystackMetadata { [key: string]: any; }