The API tool allows you to connect MESA with internal services or other services that MESA does not currently have a dedicated integration for. With MESA and the API tool together, you can now make a request to an API without writing any code.

In the following sections, you will go over important topics regarding our API tool.


In the API actions, you will find the following fields:

Method: GET, POST, DELETE, PUT, PATCH (for a summary, see this article)

URL: Endpoint of a service, for example, https://httpbin.org/anything. If you are sending URL parameters, include these here. Important: Make sure to include "https://" in the url.

Advanced Settings

Content Type: Used to tell the client about the original media type of the resource

Request Body: Will contain the information that you want to send to the service - used by POST, PUT, PATCH, and DELETE requests

Headers: Lets the client & server pass additional information with an HTTP request or response, for example, authentication tokens or the format to return. More information can be found here.

Querystring parameters: A part of a uniform resource locator (URL) that assigns values to a specified parameter(s). Example: https://example.com/over/there?name=ferret

Specify a custom Request Body: This allows you to specify text or a variable for the request body. For instance, you could specify a variable that refers to data from a previous step. The text specified here will be sent as the Request Body instead of anything specified under the Request Body above.

MESA API Actions

MESA offers 4 different in-built Actions that you can utilize to connect to an API.

No Authentication

Used for interacting with an API that does not require any authentication and provides public API access. To configure the No Authentication Action, please refer to the Configuration information above.


One of the most common ways to connect to an API.

Key: The name of your API key. Your service's API documentation will specify this.

Value: The value of your API Key that you get from the service's dashboard.

MESA will pass down the newly created credential as a key value pair in the header object. If the service expects the API key to be a query string parameter, use API's No Authentication step. Here is an example:

To configure the API Key Action, please refer to the Configuration information above.

oAuth 2.0

One of the most common ways to connect to an API but requires a more complex set-up. This requires creating an app in your service and entering the information into MESA to create a Credential. When creating an app in your service, you must use this URL as the callback URL: https://app.getmesa.com/apps/mesa/oauth/redirect-token

If your service requires MESA to make a POST request to refresh a token, you can use the Use POST for token refresh setting in the More options.

By default, MESA will refresh tokens by using query parameters. If you mark the checkbox, MESA will use POST content to refresh the content.

Basic Auth

Basic Authentication is a simpler method of authentication that involves a username and password. For example, a Shopify private app. You will need to create a Credential.


Example: API: No Authentication

When a product is updated, we will make a POST request to the following endpoint: https://httpbin.org/anything

Once a workflow runs and the request has been sent, httpbin will return the data (product title, product handle, and price) that we sent to the endpoint.

After updating a product and viewing the Logs, this was the Request:

This was the Response:

Use data obtained from an API

In this example, we will be interacting with OpenWeatherMap's API and updating a Shopify order's Notes with the current temperature of the customer's zip code once an order is created.

To utilize their API and obtain an API Key, you will need an account.

1. You can start building your own templates by clicking the New Workflow button on the right-hand side of the My workflows page.

2. Select the Shopify Order Created trigger. Next, click on Add Step > Actions, search for "API", select the API tool, and then the No Authentication action.

3. For the Method and URL, you will need to decide on your preferred endpoint. Here is an example.

4. For the Querystring parameters, you will need to add the parameters (zip and appid).

  • zip (Required): You can use MESA Variables to use the Shopify Order's zipcode and country code. For this example, the variable is (comma included): {{shopify_order.shipping_address.zip}}, {{shopify_order.shipping_address.country_code}}

  • appid (Required): Your unique API key and you can find it on your account page under the API key tab.

  • units: Optional parameter to specify the temperature units.

5. Click on the + symbol below that step and select the Shopify Update Order Notes Action. This action will only add the preferred text and will not override any existing order notes on the order.

6. In order to view the information sent by OpenWeatherMap, you will need to enable the Logging, debug mode logging, and test your workflow. To learn how to test your workflow, click here.

7. After doing a test, you can view the Logs to view the response from OpenWeatherMap with the debug logging enabled.

8. By viewing the response, you can figure out the variable to use for the later steps in the workflow.

9. In the Shopify Update Order Notes Action, fill out the following:

  • Shopify Order ID: Select the Shopify Order Created ID variable by clicking on the [<>] icon.

  • Notes: If you want to pass the current temperature data down in your workflow, you can use this variable: {{api.main.temp}}

To create a custom variable, you can click on the plus sign icon next in Settings for that particular API step. Then, click on Copy key.

In one of the fields, you can type {{ and then paste the copied value. Next, you can manually type in the data that you'd like to send. End the variable with }}

An example of a custom variable is: {{api.feels_like}}

Here is an example of updating the order notes with the current temperature.

Send nested data to an API

To send nested data to an API, you can use dot notation. Here is an example of a nested data structure, with the data nested under data:

  "data": {
    "order_id": "2975040733210",
    "total_price": "403.00"

Here is how you would set this up in MESA.

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