Changes to Generate a payment URL

the response property wallet_transaction_payment_details became required for the status 200

the response property wallet_transaction_payment_details/external_customer_id became required for the status 200

the response property wallet_transaction_payment_details/lago_customer_id became required for the status 200

the response property wallet_transaction_payment_details/lago_wallet_transaction_id became required for the status 200

the response property wallet_transaction_payment_details/payment_provider became required for the status 200

the response property wallet_transaction_payment_details/payment_url became required for the status 200