feat - Allow Phone Payments to Update Payment Request Status

[maniamartial]

This change allows phone payments (e.g., M-Pesa) to update the status of a Payment Request once the payment is complete.

Change Details:

`if self.payment_channel == "Phone":
    return` 

• This logic previously prevented phone payments from progressing, causing issues in scenarios like M-Pesa payments where the status needs to be updated automatically.

Impact:

• Ensures smoother integration with M-Pesa and other phone-based payment systems.
• Payment Requests will now correctly reflect their status for phone payments once payment completion is detected.
  Fixing issue Allow Phone Payments to Update Payment Request Status Automatically #249