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1. Supporting Document References: References to relevant contracts, invoices, or other documents that establish the basis for payment - include when payment relates to specific documented transactions

2. Collection Method Specifications: Specific instructions about acceptable payment methods - include when there are restrictions on payment forms

3. Authorized Party Obligations: Specific requirements for the authorized party regarding reporting or handling of collected funds - include for complex collection arrangements

4. Revocation Clause: Terms for revoking the authorization - include when authorization period is indefinite or long-term

5. Language Declaration: Statement about governing language if letter is bilingual - include when document is in multiple languages

1. Copy of Original Invoice: Attached copy of the invoice for which payment is to be collected

2. Identification Documents: Copies of identification documents of both authorizing and authorized parties

3. Payment Details Schedule: Detailed breakdown of payment components if multiple payments or complex calculation involved

4. Power of Attorney: Any existing general power of attorney if this authorization is pursuant to broader authority