# Using the company.tax_id_registrar field for German companies

When using Stripe Connect to onboard a Custom account with a `business_type` of company in Germany, part of the required verification information is the `company.tax_id_registrar` field. This information is collected automatically if using Stripe’s onboarding, but when using the API to onboard an account you will need to provide this information.
If the provided value is invalid, you will receive an API error message. For example, if attempting to use a `Berlin` value instead of `Berlin (Charlottenburg)`, you will receive this error message: `Registrar Berlin does not exist in DE.`