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.
Login in admin panel of your Magento 2 web-shop.
Navigate to Stores → Configuration → Sales → Payment methods.
Click on "Bitcoin via Spectrocoin" and fill the form enter your Merchant ID, Project ID and private key.