product token fail

[sabangnet]

When attempting to issue a token on the production server, the issuance fails with the message 'invalid_client.' Please verify the reason for the token issuance failure.

1. Request URL
https://api.sandbox.ebay.com/identity/v1/oauth2/token

2. Request Header
Authorization: Basic c29vYmlua2ktc2FiYW5nbmUtUFJELTc1YmFmYjFmNC1kNGVjOWJiNjpQUkQtNWJhZmIxZjQ2N2NjLTQ3NjYtNDU3NS1hZDMxLTA3ODM=

3. Request Body
grant_type:authorization_code
code:v^1.1#i^1#r^1#f^0#I^3#p^3#t^Ul41XzExOkI2MTcwN0NFQzMzNUM0MzJBQTlDQzk1NEZDM0ZDQ0IyXzBfMSNFXjI2MA==
redirect_uri:soobin_kim-soobinki-sabang-gxboac

4. Response Body
{
    "error": "invalid_client",
    "error_description": "client authentication failed"
}