You can check the API documentation to generate code to do this in any language. However, here is a simple example of how you can create a user if you’re using Node.js and Prisma.
Ensure you have your client ID from https://builder.dfda.earth and access tokens set properly in your environment variables.
To securely manage your FDAI client credentials (DFDA_CLIENT_ID and DFDA_CLIENT_SECRET), it’s recommended to use environment variables. This approach helps in keeping sensitive information out of your source code. Here’s how you can set up and use a .env file for this purpose:
  1. Create a .env File: In the root of your Node.js project, create a file named .env. Inside this file, you can define your FDAI client credentials like so:
 DFDA_CLIENT_ID=yourClientIdHere
 DFDA_CLIENT_SECRET=yourClientSecretHere
Replace yourClientIdHere and yourClientSecretHere with your actual FDAI client ID and secret.
Make sure to never expose your client secret in your client side code. This is strictly backend stuff.
  1. Load Environment Variables: To load the variables from your .env file, you’ll need a package like dotenv. If you haven’t already installed dotenv, you can do so by running:
npm install dotenv
Then, at the very top of your main application file (or at least before you use any environment variables), require and configure dotenv: 
require('dotenv').config(); // Load environment variables
  1. Access Environment Variables: Now, you can access DFDA_CLIENT_ID and DFDA_CLIENT_SECRET anywhere in your application using process.env.DFDA_CLIENT_ID and process.env.DFDA_CLIENT_SECRET, respectively. Here’s an updated snippet of your function getDfdaAccessToken incorporating the loading of environment variables using dotenv:
// Required Imports
import fetch from 'node-fetch';
import { PrismaClient } from '@prisma/client';
require('dotenv').config(); // Load environment variables

// Initialize Prisma Client
const prisma = new PrismaClient();

// Function to create or retrieve an FDAI user's access token linked to your system's user ID
async function getDfdaAccessToken() {
  const yourUserId = getLoggedInUserId(); // You'll need to implement this function to get the user ID
  // Attempt to fetch the user from your database
  let your_user = await prisma.user.findUnique({
    where: { id: yourUserId }
  });

  // Check if the user already has an FDAI access token and return if exists
  if (your_user && your_user.dfda_access_token) {
    return your_user.dfda_access_token;
  }

  // If not, create a new FDAI user using the API
  let response = await fetch(`https://safe.dfda.earth/api/v1/user`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-Client-ID': process.env.DFDA_CLIENT_ID,
      'X-Client-Secret': process.env.DFDA_CLIENT_SECRET
    },
    body: JSON.stringify({ clientUserId: yourUserId })
  });

  response = await response.json();
  const dfdaUser = response.user;

  // Update your user data with FDAI user access token details
  await prisma.user.update({
    where: { id: yourUserId },
    data: {
      dfda_user_id: dfdaUser.id,
      dfda_access_token: dfdaUser.accessToken,
      dfda_refresh_token: dfdaUser.refreshToken,
      dfda_access_token_expires_at: new Date(dfdaUser.accessTokenExpires).toISOString()
    }
  });

  // Return the FDAI user's access token
  return dfdaUser.accessToken;
}

​
Usage

You can then use the access token to make authenticated requests to the FDAI API like this: 
  const response = await fetch(`https://safe.dfda.earth/api/v1/user`, {
      method: 'GET',
      headers: {
          'accept': 'application/json',
          'Authorization': `Bearer ${getDfdaAccessToken()}`,
      },
      credentials: 'include'
  });

Record Measurements

See an example of how to create a measurement using the access token.