Cashback on Slash is paid out monthly net 25. This means:
Cashback earned for transactions made from January 1st - January 31st will be redeemable on February 25th
Cashback earned for transactions made from February 1 - February 28th will be redeemable on March 25th
and so on...
What is pending cashback?
Your pending cashback is the sum of all earned cashback that is not yet redeemable.
If it is after the 25th of the month, then it should be equal to your cashback rate * your current month's spend
If it is before the 25th on any given month, then it should be equal to your cashback rate * (your current month's spend + last month's spend)
What is available cashback?
Your available cashback is cashback that is redeemable right now.