Download the VirtueMart Bitcoin Payment Extension.
Open Administration panel of Joomla.
Install Extension at Extensions → Manage → Install page.
Choose downloaded archive and click "Install".
Generate Private and Public keys:
Go to SpectroCoin page and open
"Project" section, then click on your project. Select "Edit Project" and then click "Generate" button (next to the Public key field). You will get an automatically generated private key – download and save it. Matching Public key will be generated automatically and added to your project.
Configure SpectroCoin options in VirtueMart → Payment Methods.
At Payment Method Information enter your Payment Name, Payment Description and Payment Method. At configuration enter your Project (API) ID, Merchant ID and Private key.