Dear Abdulla Shameel,
Thanks for your concern,
There are 2 types of Vietnam visa fees you must be awared before apply a visa on arrival: VISA SERVICE FEE and VISA STAMPING FEE
for visa service fee please check https://www.vietnam-evisa.org/visa-fee/maldives.html
The visa stamping fee is a fee which direct payment to Vietnam Immigration Officer at the arrival Airport
to get your visa stamp. This is fix amount to pay for Government. the stamping fee is $25 for single entry
visa (both 1 month and 3 month type) and $50 for multiple entry visa (both 1 month and 3 month type).
Stepfanno Tran (Mr. )