Fix Doc - Set Redirect URL to optional parameters

[rootchips]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 840

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 839:	0.0%
Covered Lines:	185
Relevant Lines:	185

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💛 - Coveralls

[crynobone]

Both structure can be used. The current structure in the doc is actually preferred.

[rootchips]

Salam Tuan @crynobone. Thanks for reply. Sorry for didn't provide the description in the comment earlier.

I tried to create bill and did follow the current structure for alternative way to set redirect url in array like

['callback_url' => 'http://example.com/webhook/', 'redirect_url' => 'http://example.com/redirect/']

But it throws an error Argument 1 passed to Billplz\PaymentCompletion::__construct() must be of the type string, array given, called in /project/vendor/jomweb/billplz/src/Base/Bill.php on line 50

Is 4.x branch can be used for this alternative?

[crynobone]

My mistake, the alternative method is by using new Billplz\PaymentCompletion($callbackUrl, $redirectUrl)