Login error in API.

@tahayabali  could you also share the code that you use to put the note? 

Please check that you use the cookie that you receive from the login request.

Sure below is my code for putting note. DO i need to return ASP session id only or the complete cookie in the header request?

“”

    def write_note_to_cusomter(customer_id, tax_id, login):
        """
        write a note on customer if sales id is valud or invalid
        """        
        
       
        url = "http:/my company/AcumaticaSB/entity/Default/22.200.001/Customer?$filter=CustomerID eq '{customer_id}'"

        # Define the payload data
        payload = {
            "custom": {
                "BAccount": {
                    "NotePopupText": {
                        "type": "CustomStringField",
                        "value":f"This customer have invalid Certificate. Tax ID:{tax_id}"
                    }
                }
            }
        }

        headers = {
        'If-None-Match': '*',
        'Content-Type': 'application/json',
        'Cookie':login
        }
        response = requests.put( url, headers ,json=payload)

        if response.status_code == 200:
            print("Data successfully updated.")
            
        else:
            print("Error in putting note")””

@Dmitrii Naumov which cookie i need to return? Look image below. I am using separate files one is to login and one to call the put api

The ASP.NET_SessionId cookie needs to be sent with the Put request.

It’s better to set all of them though. There are some additional ones, e.g Locale

I tried just with ASP.Net sessiond cookie but it failed So now I am trying with the whole like locale, APXAUth and others.

I have added thse ['.ASPXAUTH', 'ASP.NET_SessionId', 'Locale', 'UserBranch', 'requestid', 'requeststat']

but still the same problem. In Post man it works fine but in script it is raising login error, 

Here is my code that logs in and Gets all customers. and Logs out.  Use Sessions. Much Easier

import requests
import json

# Acumatica API base URL
base_url = 'https://your_site.acumatica.com/entity'

# Credentials
username = ''
password = ''




# Create a session
session = requests.Session()
try:
    # Authenticate
    login_url = base_url + '/auth/login'
    print(login_url)
    response = session.post(login_url, json={'name': username, 'password': password, "tenant": "your_tennant",  "branch": ""})

    # Check if authentication was successful
    if response.status_code == 204:
        print("Authentication successful")

        # Example GET request to retrieve data
        get_url = base_url + "/Default/23.200.001/Customer"
        payload = {

        }


        # Attempt to retrieve data
        try:
            response = session.get(get_url)
            print(response.text)

        except Exception as e:
            print("An error occurred while retrieving data:", str(e))
    else:
        print("Authentication failed:", response.status_code)
except Exception as e:
    print("An error occurred during authentication:", str(e))
finally:
    # Logout
    logout_url = base_url + '/auth/logout'
    session.post(logout_url)
    print("Logged out")

def login_to_acumatica():

    # API endpoint

    url = "http://mycompany/AcumaticaSB/entity/Auth/login"

    json_data = ({

        "name": "your_username",

        "password": "your_pass",

        "tenat": “Your tenat",

        "branch": "",

        "locale": ""

        })

    try:

        # Send POST request with JSON body

        session = requests.Session()

        response = session.post(url,  json=json_data)

        print(session.cookies.get_dict())

        import re

        # Check if the request was successful

        if response.status_code == 204:

            print("Login successful.")

            print("Response:")

        return session

    except Exception as e:

        print("An error occurred:", e)