server.py

import logging
import os

from flask import Flask, request
from paypalserversdk.http.auth.o_auth_2 import ClientCredentialsAuthCredentials
from paypalserversdk.logging.configuration.api_logging_configuration import LoggingConfiguration, \
    RequestLoggingConfiguration, ResponseLoggingConfiguration
from paypalserversdk.paypal_serversdk_client import PaypalServersdkClient
from paypalserversdk.controllers.orders_controller import OrdersController
from paypalserversdk.models.amount_with_breakdown import AmountWithBreakdown
from paypalserversdk.models.checkout_payment_intent import CheckoutPaymentIntent
from paypalserversdk.models.order_request import OrderRequest
from paypalserversdk.models.purchase_unit_request import PurchaseUnitRequest
from paypalserversdk.api_helper import ApiHelper

app = Flask(__name__)

paypal_client: PaypalServersdkClient = PaypalServersdkClient(
    client_credentials_auth_credentials=ClientCredentialsAuthCredentials(
        o_auth_client_id=os.getenv('PAYPAL_CLIENT_ID'),
        o_auth_client_secret=os.getenv('PAYPAL_CLIENT_SECRET')
    ),
    logging_configuration=LoggingConfiguration(
        log_level=logging.INFO,
        # Disable masking of sensitive headers for Sandbox testing.
        # This should be set to True (the default if unset)in production.
        mask_sensitive_headers=False,
        request_logging_config=RequestLoggingConfiguration(
            log_headers=True,
            log_body=True
        ),
        response_logging_config=ResponseLoggingConfiguration(
            log_headers=True,
            log_body=True
        )
    )
)

'''
Health check
'''
@app.route('/', methods=['GET'])
def index():
    return {"message": "Server is running"}

orders_controller: OrdersController = paypal_client.orders

'''
Create an order to start the transaction.

@see https://developer.paypal.com/docs/api/orders/v2/#orders_create
'''
@app.route('/api/orders', methods=['POST'])
def create_order():
    request_body = request.get_json()
    # use the cart information passed from the front-end to calculate the order amount detals
    cart = request_body['cart']
    order = orders_controller.orders_create({
      "body": OrderRequest(
        intent=CheckoutPaymentIntent.CAPTURE,
        purchase_units=[
          PurchaseUnitRequest(
             AmountWithBreakdown(
                 currency_code='USD',
                 value='100.00'
             ) 
          )
        ]
      ),
      "prefer": 'return=representation'
      }
    )
    return ApiHelper.json_serialize(order.body)

'''
 Capture payment for the created order to complete the transaction.

 @see https://developer.paypal.com/docs/api/orders/v2/#orders_capture
'''
@app.route('/api/orders/<order_id>/capture', methods=['POST'])
def capture_order(order_id):
    order = orders_controller.orders_capture({
        'id': order_id,
        'prefer': 'return=representation'
    })
    return ApiHelper.json_serialize(order.body)