CyberSource Secure Acceptance integration with REST Api in php

I'm trying to integrate Cyber Source Payment gateway in php using REST API. And I found following reference link in github

After required changes finally I can able to login (Authenticate) to Cyber source but, Im getting below error. (I can check the logs from Cyber Source)

req_reference_number: 474 => ERROR 101 - Request parameters are invalid or missing

signed: true

Array
(
    [auth_trans_ref_no] => 474
    [decision] => ERROR
    [message] => Request parameters are invalid or missing
    [reason_code] => 101
    [req_access_key] => 5e00e27842d73381b0**************
    [req_amount] => 569
    [req_bill_to_address_city] => Mountain View
    [req_bill_to_address_country] => US
    [req_bill_to_address_line1] => 1 My Apartment
    [req_bill_to_address_line2] => 2 nd street
    [req_bill_to_address_postal_code] => 94043
    [req_bill_to_address_state] => CA
    [req_bill_to_email] => someemail@somedomain.com
    [req_bill_to_forename] => Elavarasan
    [req_bill_to_phone] => 6508764564
    [req_bill_to_surname] => Natarajan
    [req_currency] => USD
    [req_customer_ip_address] => 127.0.0.1
    [req_device_fingerprint_id] => v1rh0p44gpnhag1a7mfp9tst25
    [req_item_0_code] => KFLTFDIV
    [req_item_0_name] => KFLTFDIV
    [req_item_0_quantity] => 1
    [req_item_0_sku] => sku001
    [req_item_0_unit_price] => 20.00
    [req_item_1_code] => KFLTFD70
    [req_item_1_name] => KFLTFD70
    [req_item_1_quantity] => 1
    [req_item_1_sku] => sku002
    [req_item_1_unit_price] => 10.00
    [req_line_item_count] => 2
    [req_locale] => en-us
    [req_merchant_defined_data1] => MDD1
    [req_merchant_defined_data2] => MDD2
    [req_merchant_defined_data3] => MDD3
    [req_merchant_defined_data4] => MDD4
    [req_merchant_descriptor] => Krungsri
    [req_override_custom_cancel_page] => http://localhost/cyphp/sa-wm/response.php
    [req_override_custom_receipt_page] => http://localhost/cyphp/sa-wm/response.php
    [req_profile_id] => *******************************
    [req_reference_number] => 474
    [req_transaction_type] => sale
    [req_transaction_uuid] => 5aa6329409169
    [required_fields] => payment_method
    [signature] => IJ0iEsOJLZe2W4dNrogdzp8op8Evon2wU1KvA3W6SzM=
    [signed_date_time] => 2018-03-12T07:57:00Z
    [signed_field_names] => decision,req_access_key,req_profile_id,req_transaction_uuid,req_transaction_type,req_reference_number,req_amount,req_currency,req_line_item_count,req_locale,req_override_custom_receipt_page,req_override_custom_cancel_page,auth_trans_ref_no,req_item_0_code,req_item_0_name,req_item_0_quantity,req_item_0_sku,req_item_0_unit_price,req_item_1_code,req_item_1_name,req_item_1_quantity,req_item_1_sku,req_item_1_unit_price,req_bill_to_forename,req_bill_to_surname,req_bill_to_email,req_bill_to_phone,req_bill_to_address_line1,req_bill_to_address_line2,req_bill_to_address_city,req_bill_to_address_state,req_bill_to_address_country,req_bill_to_address_postal_code,req_customer_ip_address,req_device_fingerprint_id,req_merchant_defined_data1,req_merchant_defined_data2,req_merchant_defined_data3,req_merchant_defined_data4,req_merchant_descriptor,required_fields,reason_code,message,signed_field_names,signed_date_time
    [utf8] => ✓
)

If I rename or remove any parameter, then authentication is failed. So I hope that, I'm passing some wrong value. But I couldn't find out which one is..

I tried to change almost every field values which I'm passing, but every time getting same error

ERROR 101 - Request parameters are invalid or missing

Finally I found sample code (php) from Cyber Source, we just have to configure as per the credential. Here is the link

Source Code

You have to define you Secret key in security.php file

define ('SECRET_KEY', '7f15d699ff14461b9a84*****');

And, access_key and profile_id in signeddatafields.php file

<input type="hidden" name="access_key" value="5e00e27842d73******">
<input type="hidden" name="profile_id" value="43C533AC-****-****-****-*********">

That's it.