Using PayPal our client today had to pay a total of 4,933.5 Can $ to transfer 105840.68 thb to our PayPal account.

With TransferWise that would have been only 4,625 Can $.

Did you expect a difference of 308.5 Can $ ?

See on a real example how much a bank takes vs a money sender : 

https://aleyagarden-plants-wholesale-shipping.blogspot.com/2020/02/banks-vs-money-senders-fees-and.html

Hoya and other plant collections are for sale on aleyagarden.com. Plant care information is available in various posts of this blog :
http://aleyagarden-blog.blogspot.com/2011/02/aleyagarden-blogs.html
Contact : aleyagarden@hotmail.com

Paypal vs TransferWise

Paypal
On 1 October sender sends 1000 US$ plus total fees 44 US$ ( 4.4 % ), and at paypal exchange rate we receive 29117 thb on our bank account minus a paypal fixed fee of 11 thb : 29106 thb is what we receive from the sender's 1044 US$
29106 thb / 1044 $ = 27.87 thb are received per $ sent to paypal

TransferWise
On the same day sender sends 1000 US $ plus total fees 10.77 USD, we receive at TransferWise exchange rate 30354.52 thb on our bank account.
30354.52  / 1010.77 = 30.03 thb are received per $ sent to TransferWise

30.03 - 27.87 = 2.16  thb per $ is how much you lose when using paypal instead of TransferWise or a similar money sender on 1st October 2019 when sending in the 1000US$ range.