Hello<br><br>401
Array
(
    [0] => HTTP/1.1 100 Continue
    [1] => 
    [2] => HTTP/1.1 401 Unauthorized
    [3] => Server: nginx
    [4] => Date: Sat, 26 Jul 2025 02:04:59 GMT
    [5] => Content-Type: application/json
    [6] => Content-Length: 116
    [7] => Connection: keep-alive
    [8] => Access-Control-Allow-Origin: https://sendgrid.api-docs.io
    [9] => Access-Control-Allow-Methods: POST
    [10] => Access-Control-Allow-Headers: Authorization, Content-Type, On-behalf-of, x-sg-elas-acl
    [11] => Access-Control-Max-Age: 600
    [12] => X-No-CORS-Reason: https://sendgrid.com/docs/Classroom/Basics/API/cors.html
    [13] => Strict-Transport-Security: max-age=31536000; includeSubDomains
    [14] => Content-Security-Policy: frame-ancestors 'none'
    [15] => Cache-Control: no-cache
    [16] => X-Content-Type-Options: no-sniff
    [17] => Referrer-Policy: strict-origin-when-cross-origin
    [18] => 
    [19] => 
)
{"errors":[{"message":"The provided authorization grant is invalid, expired, or revoked","field":null,"help":null}]}
Response = <br>