Calculate emissions with the API and generate checkout links for offsetting

Learn how to create API keys, select emission factors and use the API to calculate emissions and generate checkout links.

Preparation

First of all, familiarize yourself with how we Calculate emissions.

Create an API key

Open the developer menu in the dashboard and navigate to API Keys. Now click on Add new API keys. To calculate emissions, your API keys require write permissions.

Important: Save the secret key and never pass it on to third parties!

Find suitable factors

Now find the right emission factors for you from our database. You can submit up to 100 calculation options per request to our API.

Make an API Request

Now use the endpoint /orders/link/calculate to calculate the emissions and create checkout links with the calculated emissions.

Good to know: You can also use our PHP Library or Node.js Library to interact with the API.

Options

Currency

Use the header parameter X-CURRENCY to select the currency in which the result of the API and the checkout link should be returned. There are over 100 currencies to choose from.

Language

Use the X-LOCALE header parameter to select the language in which the result of the API and the checkout link should be returned.

Calculation Options

Now transfer the calculation_options you have defined to the API. You can calculate up to 100 calculation_options at the same time.

Success & Cancel URLs

Use the success_url & cancel_url parameters to select where the user of the checkout link should be redirected after a successful and canceled payment.

Order Count

Adjust the order_count parameter to get up to 3 checkout links with one API call.

By default, we always round up the calculated emissions to the nearest kilogram. If you want a more precise calculation, you can simply use fractional_digits to define the maximum number of decimal places returned.

Example

In this example, we calculate the emissions of a trip from Berlin to Munich and create a checkout link with the result.

POST/v2/orders/link/calculate

API Docs

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{
    "calculation_options": [
        {
            "type": "travel-land",
            "activity": "cars_by_market_segment",
            "specification": "average",
            "detail": "average",
            "value": 2000,
            "unit": "kilometers"
        }
    ],
    "change_allowed": true,
    "success_url": "https://your-business.com/success",
    "cancel_url": "https://your-business.com/cancel",
    "order_count": 1
}

Response

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{
    "payment_link": "https://klimapi.com/checkout/1c137daf-d3d7-42ad-8d7c-6429e8840957",
    "payment_link_id": "00000000-0000-0000-0000-000000000000",
    "certificate_url": null,
    "certificate_pdf": null,
    "order_id": "CA-0000-00000000",
    "price": 10,
    "currency": "EUR",
    "kgCO2e": 448,
    "payment_received": false,
    "project": {
        "id": "00000000-0000-0000-0000-000000000000",
        "title": "Example Project",
        "summary": "Example Summary",
        "status": "Active",
        "category_id": 3,
        "certification_authority_id": 2,
        "country": "Example Country",
        "description": null,
        "goals": null,
        "images": [
            "https://cdn.klimapi.com/projects/00000000-0000-0000-0000-000000000000_1.jpeg",
            "https://cdn.klimapi.com/projects/00000000-0000-0000-0000-000000000000_2.jpeg"
        ],
        "benefits": [
            7,
            8,
            13
        ]
    },
    "results": [
        {
            "type": "travel-land",
            "activity": "cars_by_market_segment",
            "specification": "average",
            "detail": "average",
            "value": 2000,
            "unit": "kilometers",
            "kgCO2e": 447.26
        }
    ]
}

Concepts