A letter from your employer confirming your employment status and the nature of your activities in Peru. Please make sure that the letter includes your passport number and it mentions that all expenses are covered by your employer.
Proof of solvency of your company.
In case your trip is related to a Peruvian counterpart, letter from such Peruvian company signed by the company's representative, and his/her peruvianID number, or passport number and / or Foreigner's Identity Card number (Carnet de Extranjería, for foreigners)
Please be adviced that a police record (Police National Computer Form - Form 3019B) and/or a personal interview with a consular officer may be required.