Fastfile.rb

platform :ios do
  
  desc "Get certificates"
  lane :certificates do
    sync_code_signing(
      type: "development",
      app_identifier: ['com.company.example', 'com.company.example.stg'],
      force_for_new_devices: true,
      readonly: true
    )

    # You can repeate the sync_code_signing with other types of certificates such as appstore and adhoc
    sync_code_signing(
      type: "appstore",
      app_identifier: 'com.company.example',
      readonly: true
    )
  end

  desc "Generate new certificates"
  lane :generate_new_certificates do
    sync_code_signing(
      type: "development",
      app_identifier: ['com.company.example', 'com.company.example.stg'],
      force_for_new_devices: true,
      readonly: false
    )
    
    # You can repeate the sync_code_signing with other types of certificates such as appstore and adhoc

  end
end