How long does the authToken from sessions api is valid?

There is no “issuedAt” field in the response of sessions api . It just provides expiry and refresh time in duration. Here is the response of the sessions Api :
{
“accessToken”:"",
“expiresIn”:21600,
“refreshExpiresIn”:1800,
“refreshToken”:"",
“tokenType”:“bearer”
}
The problem is that how do you guys calculate timestamp when it expires as the response should have “issuedAt” time to calculate timestamp of expiry.

afaik on sandbox it is available for 5 mins .

@IntegrationSupport please confirm.

Thanks

@abhishek.luthra Access token for sandbox: 6 hours (21600 seconds)
X token - (comes after trxn ID) - 1800 seconds (30 mins)
Refresh - 1800 seconds (30 mins) - For sessions
Session token - 30 mins
all gateway sessions will be valid for 10 sec only

Do we have a documentation explaining in detail how refresh token needs to be used ?

@abhishek.luthra We do not have any resource for the same, You can generate X token which is expired by using refresh token.