Request for Assistance with Square API Integration


I am currently integrating the Square API into my application using C#. I am facing difficulties establishing a successful connection to the Square Sandbox environment despite several attempts and checks.

Error Details:

  • I am using the Square SDK version [SDK version].
  • My access token for the Sandbox environment is correctly configured in my application.
  • I have updated the SDK via NuGet to ensure I am using the latest available version.
  • I have verified that my development environment has functional internet access and that my firewall is not blocking outgoing calls to Square’s servers.

Code Used:

var SANDBOX_ACCESS_TOKEN_TEST = "sandbox-YourAccessTokenHere"; 

    var sqClient1 = new SquareClient.Builder()

    Console.WriteLine("Square client connected successfully.");
catch (Exception ex)
    Console.WriteLine($"Error initializing Square client: {ex.Message}");

Actions Taken:

  • I have conducted thorough checks of the access token to ensure it is correctly formatted and not null.
  • I have included exception handlers to capture and display any errors that occur during the initialization of the Square client.

Request: I kindly request your assistance in understanding why the connection to Square’s Sandbox is not working despite my efforts. Could you please provide suggestions or additional steps to resolve this issue?

Thank you in advance for your valuable assistance.

:wave: I’m Square Dev AI, here to help answer your question!
Based on the information you’ve provided, the following documentation will help answer your question:

Additional Documentation

Square Sandbox
Square SDKs

If this documentation helped you find a solution, please check the box indicating that this reply solves the problem.
Otherwise one of our Developer Advocates will provide additional assistance shortly.

Based on the information you’ve provided, it seems like you’ve taken the correct steps to establish a connection with Square’s Sandbox environment. However, there are a few additional things you could check:

  1. Ensure that the access token you’re using is the correct Sandbox access token. You can verify this by checking your Square Developer Dashboard. Make sure you’re viewing the Sandbox settings for your application.

  2. Check if there are any additional error details in the exception message or inner exception. This might provide more insight into what’s causing the issue.

  3. Make sure that the Square SDK version you’re using is compatible with the .NET version of your project.

  4. Try to make an actual API call (like ListLocations) to see if the issue is with the connection or the initialization message.

If you’ve checked all of these and are still experiencing issues, it might be a more complex problem that requires further investigation.

This answer was reviewed by @Bryan-Square.

i just used BearerAuthCredentials to connect and it works.

  client = new SquareClient.Builder()
                     new BearerAuthModel.Builder(