Detailed description
If you would like to help someone obtain a national visa or a residence permit for more than 90 days, you can submit a declaration of sponsorship.
With a declaration of sponsorship, you commit to covering the costs of living if the person is unable to do so themselves. This includes, for example, costs for food, housing, clothing, medical care, and the cost of returning to their home country. Your declaration of sponsorship then serves as proof of fulfilling the financial requirements in the application process for a national visa and a residence permit.