I have to attend conference from 24 to 28 June 2018 in Vietnam. Kindly inform what is accredition letter? As I have ben informed that without accredition letter from vietnam my visa will not be processed.

Dear Amin Ullaj, 

Thank you for your concern.

 The Vietnam Visa Approval Letter is a pre-approved application you need before entering Vietnam. You can get the Approval Letter or Vietnam Visa at local Vietnam Embassy by yourself.

- If you have no free-time or stay far away the local Vietnam Embassy, our service can support you to apply the pre-approved letter for Vietnam Visa through a travel agent in Vietnam quickly and most conveniently.

You can follow the link to apply online : https://www.vietnam-evisa.org/apply-visa.html

Apply visa online, You will get visa stamp on the passport upon arrival, All you need to do is fill your information in the form and make payment online
after that, we will send You the approval letter via email, please print it out to board the plane and use it to get visa stamp on the passport upon arrival.

Best Regards.
Stepfanno Tran (Mr. )