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This would be a plugin for VirtueMart to implement the CoinPayments.net payment gateway and handl IPN notifications. Complexity is similar to PayPal Website Payments Standard.
Documentation for the payment button/redirect during checkout: https://www.coinpayments.net/index.php?cmd=merchant_tools&sub=buttons
Button image: https://www.coinpayments.net/images/pub/buynow-med-grey.png
IPN Documentation: https://www.coinpayments.net/index.php?cmd=merchant_tools&sub=ipn
The IPN handler should check for duplicate posts so payments aren't double-processed. Here is a plugin written for the system for another shopping cart you can use for reference also: https://www.coinpayments.net/downloads/drupal_commerce_coinpayments.zip
If you have any questions I'll be glad to help any way I can.