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46. Payment preference and user charge

Now, we will add the functionality to charge the user. We will follow the guidance provided in the Mercado Pago API documentation.

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We will start by pasting the following code into our api_mercadopago.py file:

api_mercadopago.py
import mercadopago

public_key = "APP_USR-8e9c2811-1d99-4346-b8a0-9118201f7216"
access_token = "APP_USR-1378561128003766-083016-a08284dad9da4451cc196354af9f6722-1968090813"

#configure your credentials
sdk = mercadopago.SDK(access_token) #? validating access token

# Create items in the preference. preference = personalized charge for clients
preference_data = {
    "items": [
        {
            "title": "Mi producto",
            "quantity": 1,
            "unit_price": 75.56
        },
        {
            "title": "Mi producto2",
            "quantity": 2,
            "unit_price": 96.56
        }
    ], #? links that will be loaded
    "back_urls": {
        "success": "http://localhost:8000/mercadopago/success/",
        "failure": "http://localhost:8000/mercadopago/failure/",
        "pending": "http://localhost:8000/mercadopago/pending/"
    },
}

# Create a preference
preference_response = sdk.preference().create(preference_data) #? creating request with various informations about the payment
link = preference_response["response"]["init_point"]
payment_id = preference_response["response"]["id"] #? obtaining the payment id to treat it

Here's a explanation of the updated code:

  • Import Library: import mercadopago

    • Imports the Mercado Pago SDK to handle payment processing.

  • API Credentials:

    • public_key = "APP_USR-8e9c2811-1d99-4346-b8a0-9118201f7216"

    • access_token = "APP_USR-1378561128003766-083016-a08284dad9da4451cc196354af9f6722-1968090813"

    • Defines the public key and access token for Mercado Pago authentication.

  • Configure SDK: sdk = mercadopago.SDK(access_token)

    • Initializes the Mercado Pago SDK using the access token.

  • Preference Data:

    • preference_data: Dictionary containing payment details and URLs.

      • "items": List of items in the order, with each item including:

        • "title": Product name.

        • "quantity": Number of units.

        • "unit_price": Price per unit.

      • "back_urls": Dictionary of URLs to redirect users based on payment status:

        • "success": URL for successful payments.

        • "failure": URL for failed payments.

        • "pending": URL for pending payments.

  • Create Preference: preference_response = sdk.preference().create(preference_data)

    • Sends a request to Mercado Pago to create a payment preference with the provided preference_data.

  • Extract Response Data:

    • link = preference_response["response"]["init_point"]: Retrieves the URL to redirect the user for payment.

    • payment_id = preference_response["response"]["id"]: Retrieves the unique ID for the created payment preference for further processing.

The dictionary returned in preference_response contains information about the payment, as shown below:

The key we are primarily interested in is 'init_point', which contains a URL for the payment page that the user will access.

Note that the payment details exhibited on the page are the ones contained in the preference_data dictionary.

Also, note we still need to finish some modifications for the payment system to be fully operational.

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