[RPC] Create Billplz\PaymentCompletion class to handle callback and redirect urls when creating bills.

[crynobone]

Current Behaviour.

use Duit\MYR;

$response = $bill->create(
    'inbmmepb',
    'api@billplz.com',
    null,
    'Michael API V3',
    MYR::given(200),
    ['callback_url' => 'http://example.com/webhook/', 'redirect_url' => null],
    'Maecenas eu placerat ante.'
);

New Behaviour

use Billplz\PaymentCompletion;
use Duit\MYR;

$response = $bill->create(
    'inbmmepb',
    'api@billplz.com',
    null,
    'Michael API V3',
    MYR::given(200),
    new PaymentCompletion('http://example.com/webhook/', null),
    'Maecenas eu placerat ante.'
);

Signed-off-by: Mior Muhammad Zaki crynobone@gmail.com

[coveralls]

Pull Request Test Coverage Report for Build 750

• 11 of 11 (100.0%) changed or added relevant lines in 2 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 738:	0.0%
Covered Lines:	185
Relevant Lines:	185

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💛 - Coveralls