Array
(
    [0] => Content-Type:application/json
    [1] => User-Agent:Mozilla/5.0
    [2] => v-c-merchant-id:07960900
    [3] => Signature:keyid="1cd07536-de32-4406-bed5-e4d44e013531", algorithm="HmacSHA256", headers="host date (request-target) digest v-c-merchant-id", signature="HA30xRdsbtdJ3KnyMijigcjLM5q/93sXEkuAgQsWG64="
    [4] => Host:api.cybersource.com
    [5] => Date:Tue, 16 Dec 2025 5:14:14 GMT
    [6] => Digest: SHA-256=CEFAvlZJjLpeS4jqTgV/tdUl/27EG4sElzye1dMBbFU=
)
{"response":{"rmsg":"Authentication Failed"}}