Azure Databricks notebook not picking the parameters passed via job api

Flask application –> Capturing the value entered via web form and passing it as a parameter to trigger a databricks job.

Tried passing the parameters as follows :

1- payload = {
>             'notebook_params': {
>                 'customer_name': customer_name
>             }
2- payload = {
>             "notebook_task": {
>             "notebook_path": "/Shared/.../",
>             "base_parameters": {           
>                 "customer_name": customer_name,
>                 }
>             }
>         }

While creating the job, passed the default parameter but this does not gets overridden, if I removed it than could see blank value is getting passed.
enter image description here

In Databricks Notebook, the print command returns blank if no default value is set.

# Get the customer_name value from the parameter
dbutils.widgets.get("customer_name", "","")
customer_name = dbutils.widgets.get("customer_name")

# Use the customer_name in your notebook logic
print("Customer Name:", customer_name)

Could see the following Run parameters are used to execute the job
enter image description here

I need assistance to identify if I am doing anything wrong and how I can overcome the issue.

# Get the customer_name value from the parameter
dbutils.widgets.get("customer_name", "", "")
customer_name = dbutils.widgets.get("customer_name")

# Use the customer_name in your notebook logic
print("Customer Name:", customer_name)

The above should return the customer_name= Cx4 that was passed as parameter when the job run was created via api call from the flask app.