Fix parsian gateway

[alissn]

Hi,

In this PR, I applied some advice from the bank to the parsian gateway. The changes include:

• Changing the redirect method from POST to GET.
• Passing the Originator key as the user's phone number (check the key with name such as phone, cellphone, and mobile in the details).

I also added a comment:
The bank suggests that an English description is better.

For further details, you can refer to the documentation.

<s:complexType name="ClientPaymentRequestDataBase">
    <s:sequence>
        <s:element minOccurs="0" maxOccurs="1" name="LoginAccount" type="s:string"/>
        <s:element minOccurs="1" maxOccurs="1" name="Amount" type="s:long"/>
        <s:element minOccurs="1" maxOccurs="1" name="OrderId" type="s:long"/>
        <s:element minOccurs="0" maxOccurs="1" name="CallBackUrl" type="s:string"/>
        <s:element minOccurs="0" maxOccurs="1" name="AdditionalData" type="s:string"/>
        <s:element minOccurs="0" maxOccurs="1" name="Originator" type="s:string"/>
    </s:sequence>
</s:complexType>

If you have any further questions or need more information, please let me know.