Creating Google Cloud Platform service account

• Create service account and download certificate
• Convert certificate to Base64 string

Create service account and download certificate

• Open Google Cloud Platform menu navigate to IAM & Admin
• Select Service accounts and press Create service account
  • Set descriptive Service account name, for example Appveyor CI
    • Service account ID will be automatically regenerated, write it down to use later in AppVeyor settings
  • Select Project > Editor in Role menu
  • Check Furnish a new private key
    • Select P12
  • Press CREATE
  • Close Service account created window
    • Leave default password unchanged
  • Certificate in P12 format should be saved to local computer
    • Remember it’s location and optionally re-save certificate in some secure place

Convert certificate to Base64 string

• Run the following PowerShell commands:

$bytes = [System.IO.File]::ReadAllBytes("<path-to-P12-file>")
$base64Str = [System.Convert]::ToBase64String($bytes)
[System.IO.File]::WriteAllText("<path-to-result-TXT-file>", $base64Str)

• Remember the location of the resulting TXT file.