Install/Enable the module at Admin -> modules page.
Generate Private and Public keys: Go to the SpectroCoin page, open the "Project" section, and click on your project. Select "Edit Project" and then click the "Generate" button (next to the Public key field). You will get an automatically generated private key – download and save it. A matching Public key will be generated automatically and added to your project.
Configure SpectroCoin options in Home -> Administration -> Store -> Configuration -> Payment methods.
Enter your Merchant ID, Project ID and Private key (Options are part of the reaction rule settings.)