I have just integrated coinpayments to accept ETN but it does not seem to be the instant payment system which they have used, still need to wait for blockchain confirmations to accept orders, is there a work around for this? or maybe its to be integrated in a future release?
CoinPayments work directly with the blockchains with all their supported coins so it wont be instant. The best option you have is to try to integrate the ETN Instant payment API directly. Are you using a custom platform or something that is common?
whmcs is the billing platform.
Ok, yes looks like it would actually be a pretty simple integration with the Instant Payment API. There are some https://www.whmcs.com/free-tools/ to look at already ie 2checkout and eway. If you download one of those for me and send it over we could have a look on a simple addon plugin for this.