1. Previous Correspondence: Reference to prior attempts to collect the debt, used when there has been previous communication

2. Interest Calculation: Detailed breakdown of how interest has been calculated, used when claiming interest on the debt

3. Without Prejudice: Special notation for letters containing settlement offers or negotiations

4. Third Party Authorization: Reference to authorization when acting on behalf of a client, used when representing a client rather than sending directly from creditor

5. Payment Plan Option: Proposed payment plan terms, used when willing to accept installment payments

6. Dispute Resolution: Alternative dispute resolution options, used when willing to consider mediation or arbitration

1. Original Contract: Copy of the contract or agreement that gave rise to the debt

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

3. Invoice copies: Copies of relevant invoices or billing statements

4. Payment Records: Documentation of any partial payments or payment attempts

5. Correspondence Log: Copies of previous relevant correspondence regarding the debt

6. Interest Calculation Schedule: Detailed breakdown of interest calculations if applicable