Why doesn't the Flutter API return the desired outcome, but it works when I manually input the printed results such as token and signature into Postman?

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There are several possible reasons why the Flutter API may not return the desired outcome, but the results work when manually inputted into Postman:

1. Request Headers: Postman may automatically add additional headers that the Flutter API code may not be adding. Ensure that all necessary headers are included in the Flutter API request.

2. Syntax Errors: The Flutter API may have syntax errors or typos that could cause it to fail. Double-check the code for accuracy and fix any errors.

3. Authentication: If the API requires authentication, ensure that the correct authentication method and credentials are used in Flutter API request.

4. Network Issues: There may be network issues between the Flutter API and the target server. Ensure that there is a stable and strong network connection.

5. Response Parsing: The Flutter API may not be correctly parsing the response, which could cause it to not return the desired outcome. Ensure that the response is being parsed correctly.

In summary, there could be many reasons why the Flutter API is not returning the desired outcome. It is best to systematically check for possible errors and troubleshoot accordingly.