Thai Post free pickup service - how to pay online for the postage??

 

I send our ecommerce packages daily using registered airmail. My local post office is friendly and does a good job.

 

Recently they told me they have free pickup (5+ boxes).

 

Strangely the post office staff person who does the pickup told me I would transfer the money for postage online to his personal account and he would email a copy of the receipt after he paid at the post office.

 

This sounds strange...

 

Anyone know of a bettor way to pay officially online?

 

Thank you! 

Just saw the below photo which is on a form for ordering stamps from the post office using what looks like an office bank account?

 

Maybe this account could be used?

Another option seems to be the Wallet but it is difficult to do the online signup as when I try to upload my ID the website takes a photo too fast...