1. Special Instructions: Any specific instructions or limitations on how the authorized person should handle the claim

2. Revocation Clause: Terms under which the authorization can be revoked, include when dealing with substantial sums or long-term authorizations

3. Language Declaration: Statement about the controlling language if the letter is bilingual (common in Hong Kong)

4. Indemnification: Clause protecting the authorized person from liability when acting in good faith, useful for complex claims

5. Contact Preferences: Preferred method of communication between parties, include when multiple parties or authorities are involved

1. Employment Contract: Copy of the original employment contract or relevant sections proving employment relationship

2. Pay Records: Documentation showing unpaid wages or salary calculations

3. Identity Documents: Copies of Hong Kong ID cards or passports of both authorizer and authorized person

4. Proof of Employment: Additional documentation proving employment relationship such as staff ID, correspondence

5. Calculation Schedule: Detailed breakdown of the back pay amount being claimed