Square Payments

Square Payments API Integration

Implements integration with Square Payments API, allowing for seamless transaction processing, refunds, and reporting.

When to Use

Use this skill for:

• Integrating payment processing capabilities into e-commerce applications.
• Managing refunds through the Square Payments API.
• Generating reports on transactions and sales.

Core Workflow

1. Initiate a Payment — Create a payment request for user transactions.
2. Process Payment — Handle the response from Square, ensuring transaction validation.
3. Manage Refunds — Process refunds when necessary without impacting sales reporting.

Implementation Patterns

Pattern 1: Creating a Payment Request

import requests

# Payment request details
def create_payment(amount: float, currency: str, card_token: str):
    headers = {'Authorization': 'Bearer YOUR_ACCESS_TOKEN', 'Content-Type': 'application/json'}
    payment_data = {
        'amount_money': {
            'amount': int(amount * 100),  # Amount in cents
            'currency': currency
        },
        'source_id': card_token,
        'idempotency_key': 'unique_key'
    }
    response = requests.post('https://connect.squareup.com/v2/payments', json=payment_data, headers=headers)
    response.raise_for_status()  # Raise an error for bad responses
    return response.json()

Pattern 2: Handling Refunds

# Refund transaction by Square ID

def refund_payment(payment_id: str):
    headers = {'Authorization': 'Bearer YOUR_ACCESS_TOKEN', 'Content-Type': 'application/json'}
    response = requests.post(f'https://connect.squareup.com/v2/refunds', json={'payment_id': payment_id}, headers=headers)
    response.raise_for_status()  # Raise an error for bad responses
    return response.json()

Constraints

Additional Examples

Example 1: Handling Multiple Currencies

# Function to create a payment accepting multiple currencies
def create_payment_multicurrency(amount: float, currency: str, card_token: str):
    # Extend payment processing to accept different currencies
    headers = {'Authorization': 'Bearer YOUR_ACCESS_TOKEN', 'Content-Type': 'application/json'}
    payment_data = {
        'amount_money': {
            'amount': int(amount * 100),  # Amount in cents
            'currency': currency
        },
        'source_id': card_token,
        'idempotency_key': 'unique_key'
    }
    response = requests.post('https://connect.squareup.com/v2/payments', json=payment_data, headers=headers)
    response.raise_for_status()  # Raise an error for bad responses
    return response.json()

Example 2: Reporting Summary

# Function to retrieve transaction reports
def get_transaction_summary(start_date: str, end_date: str):
    headers = {'Authorization': 'Bearer YOUR_ACCESS_TOKEN', 'Content-Type': 'application/json'}
    url = f'https://connect.squareup.com/v2/transactions?start_date={start_date}&end_date={end_date}'
    response = requests.get(url, headers=headers)
    response.raise_for_status()  # Raise an error for bad responses
    return response.json()

MUST DO

• Ensure error handling for API requests to gracefully manage failed calls.

MUST DO

• Always validate payment input before sending requests to the API.
• Use idempotency keys for payment requests to avoid double charges.

MUST NOT DO

• Do not process payments without user consent.
• Avoid sending excessive requests to the Square API to prevent rate-limiting.