1. Log in to your QuickBooks Online account, or create a new one if you don't have it yet.
2. Fill in the initial setup with your business details like name, industry, and company preferences.
3. Head over to the settings gear icon, and make sure you have admin rights. You'll need them for integration.

1. Log in to your Adalo account, or sign up if you haven’t already.
2. Click on “Create New App” and pick the type of app you want to make (Web or Mobile).
3. Follow the steps to name your app and pick a style template.

1. Go to RapidAPI and sign up or log in.
2. Look for the QuickBooks API and subscribe to it.
3. Get your API key, which you'll need for authentication and making API requests.

1. Go back to Adalo and open your project.
2. Go to the "Database" section and select "Custom Actions".
3. Click “New Custom Action”, and set up a new action for QuickBooks integration using the API endpoints from RapidAPI.
4. Put your API key where needed for authentication.

1. Define the endpoints you'll be using. Common ones might include creating invoices, getting client data, and syncing sales records.
2. Use the "baseURL" from RapidAPI and add the specific endpoint paths for QuickBooks functions.
3. Test each endpoint with sample data to make sure they're set up correctly.

1. Go to the screen where you want to use QuickBooks data.
2. Add the components, like forms or lists, that will interact with QuickBooks data.
3. For each component, use the "Add Action" feature to link it to the custom actions you've created for QuickBooks.
4. Map form inputs to endpoint fields and set up actions to trigger during form submissions or user interactions.

1. Test all QuickBooks-related features within your Adalo app thoroughly.
2. Make sure data is correctly sent to and retrieved from QuickBooks.
3. Check functionalities like creating invoices, fetching client info, and recording sales to ensure they work as expected.

1. Once testing is done and everything works, go to the "Publish" section in your Adalo app.
2. Follow the steps to publish your app either to the web, or as a mobile app on platforms like iOS or Android.
3. Keep an eye on app usage and make adjustments based on user feedback or any issues that come up.

This step-by-step guide helps you smoothly integrate QuickBooks with Adalo, making your financial operations a breeze within your custom-built app.