Performance incentives received from USA

Dinesha S Acharya (Senior Accountant) (24 Points)

23 November 2021  

Dear Sir/ Madam,

Can you guide me the above subject, 

Our company is a software development company and we have overseas transactions also. We are billing export invoice to the customer. This month the customer has declared Performance Incentive for one project, in which, whether can we raise the tax invoice or Debit Note ?

Which one is correct, please guide me and provide the information to understand ourselves.