1. Previous Communications: Reference to prior attempts to collect the debt, used when previous collection attempts have been made

2. Interest Calculation: Detailed breakdown of interest charges, included when applying interest to the outstanding amount

3. International Notice: Additional legal notices for cross-border collection, required when debtor is located outside Switzerland

4. Payment Plan Option: Proposed installment payment terms, included when willing to accept partial payments

5. Dispute Resolution: Process for disputing the debt, included when required by specific circumstances or regulations

1. Original Invoice: Copy of the original invoice(s) relating to the debt

2. Statement of Account: Detailed statement showing all transactions, payments, and current balance

3. Contract Documentation: Copies of relevant contracts or agreements that established the debt

4. Payment History Log: Detailed record of all payment attempts and communications

5. Power of Attorney: If the collection is being made on behalf of another party, documentation proving authority to collect