My summary will then be :

Walu, the buyer,  is questioning the relevance of  a solution that addresses Kioko's (the seller's) needs.

Luckily, with this solution in place, Walu and Kioko will still transact with each other while:
 - Allowing Walu to stick to his beloved 'M-PESA' mode of payment
 - Making it convenient for Kioko to easily reconcile  all his sales irrespective of what diverse modes of payment were used.

Tony.