Be able to filter when retrieving a Refund List from a Charge object.

[guzzilar]

Objective

There is a case that user wants to retrieve a Refund List in reverse_chronological order from a Charge Object.

With the current code, it is impossible to achieve the above use case as there is no way to pass those filters when retrieving Refund List object from a Charge object.

$charge  = OmiseCharge::retrieve('chrg_test_xx');
$refunds = $charge->refunds();

Quality Assurance

Execute the following 2 code

$charge  = OmiseCharge::retrieve('chrg_test_xx');
$refunds = $charge->refunds();

and

$charge  = OmiseCharge::retrieve('chrg_test_xx');
$refunds = $charge->refunds(['limit' => 3, 'order' => 'reverse_chronological']);

The second code should alter the result of the Refund List object.

Additional Notes

In the previous, the following code will always fetch a new Refund List object from Omise API.

$charge  = OmiseCharge::retrieve('chrg_test_xx');
$refunds = $charge->refunds();

But after the change, if there is no filter option passing through the $charge->refunds(); method the code will instead, assign $this['refunds'] to OmiseRefundList object (no request to Omise API).