合作过的伊朗客户要来中国，让我给他发邀请函，请问有做过的人吗？怎么写这个邀请函？
Dear Visa Officer,
We are pleased to invite Mr. XXX, customer of our company to visit XXX for business collaboration discussion for 8 days between 25th,April to 4th,May,2019.
Full name: XXX
Gender: XXX
Date of birth: xx/xx/xxxx
Nationality: XXX
Passport number: XXX
Passport issue date: xx/xx/xxxx
Passport Expire date: xx/xx/xxxx
Job Title: XXX
Please grant the relevant visa for XXX to travel. We confirm that they will be in receipt of a return ticket, they are covered by our company insurance policy, and all expenses of their journey will be met by XXX. Please do not hesitate to contact me for further questions.
Best Regards,