Wallet created using blockchain.info API. How to reach the BCH after 1 Aug fork?

[Magnetcore]

Hi,

I am using a cloud based wallet service that is using wallet API on blockchain.info to create its users wallets. During the bitcoin cash fork that happened 1 Aug 2017 I had bitcoin so I also got some BCH, which I can see when searching on my wallet address. Now I need to find a way to reach those BCH.

I understand its not possible to extract the private key using the wallet API. But can I request from the cloud based service that they provide me with the login information for the wallet that is placed on blockchain.info? And then extract the keys from the blockchain.info webservice?

Any suggestions is gladly accepted. Thanks!