feat: Plan Subscription - Paystack

[ObodoakorDavid]

What does the PR do?

This PR adds two endpoint for organisations to be able to pay for subscriptions with paystack.

How should this be manually tested?
Send a POST request to /api/v1/payments/paystack with the request body below.

Request Body

{
  "organization_id": "ad77a415-4f1c-48d7-8702-85a625c5b594",
   "plan_id": "2952977c-0686-4add-b2d1-3ee629509a74",
   "full_name": "string",
   "billing_option": "yearly",
   "redirect_url": "http://boilerplate.com/setting"
}

200 Successful Response:

{
    "status_code": 200,
    "message": "Payment initiated successfully",
    "status": "success",
    "data": {
        "payment_url": "https://checkout.paystack.com/me0ernbggquuw12"
    }
}

Once a payment is initiated, the user can be redirected to the paystack checkout screen to complete payment which would send a request to the server with the payment reference to be verified. Upon successful payment and verification of the payment reference, the server redirects to the provided redirect_url with a param of status which would be either success or failed depending on the payment status.

Error Responses:

400 Bad Request:

{
    "message": [
        "Invalid UUID for plan_id"
    ],
    "error": "Bad Request",
    "status_code": 400
}

401 Unauthorized:

{
    "message": "Your IP Is unauthorized to make this call",
    "error": "Unauthorized",
    "status_code": 401
}

500 Internal Server Error:

{
    "message": "'An error occurred while initiating the payment'",
    "error": "Bad Request",
    "status_code": 400
}

Checklist of what i did

• Implemented an endpoint to initiate payment via paystack
• Implemented an endpoint to verify payment.
• Added unit tests for the payment service.

Reference Issue on Linear
FEAT Plan Subscription - PAYSTACK