Axis has been behaving like this for a couple of weeks with all external payments.
I've used Cred ever since I got my card, and payments in CRED go through and reflect within 3-15min, you can see them credited in the Axis app in your transactions. Raised the issue several times with CRED and they blame it on Axis.
For the past two weeks they have all taken 2-3 business days, tried other apps that claim to do it instantly (and they do as per my previous experience and also like PayTM, Amazon Pay, Freecharge, etc) and it is the same issue.
Went for UPI methid and it is also taking about the same amount of time, which is strange considering the type of payment method and how it is settled, it's basically paying cash on the spot.
At this point I'm pointing my finger at Axis for this one, I'm fairly sure it's issues on their end as I've had some issues with their system that I've never had or experienced so often (pages don't load/stuck, unable to login at times, transaction failures).