SIGN STRING:
POST|/api/v1/card/register|1765508183081|5d5d67115954a7d2f0963d549d7effbe|{"cardId":"1991023839477039106","customerNo":"101320110001","documentType":2,"extend":{"addressNo":"101320410001","recipientAddressNo":"101320410001"}}

SIGN (BASE64):
x6jO0Y37RGmSaxQa1rvB0hwfksKTp27vAGibc7bHSv0=

HTTP Status Code: 200
Response:

Array
(
    [success] => 
    [ts] => 1765508184
    [data] => 
    [code] => 1005
    [msg] => Signature error
)