Engen Depriving Staff of extra income.

For over 2 years now I have been using the Engen 1 App. on my phone to buy petrol at Engen Garages between KZN and Cape Town. During 2020 an addition was made to the functionality of the app which allowed you to tip the petrol attendant who assisted you. This would be done by scanning a unique code card issued to each attendant. To me this is an excellent idea but at NO Engen garage on the KZN South Coast or ANY Engen garage between KZN and Cape Town (either on the N1 or N2) have I been able to use the tip function to tip the attendant. When I ask the attendant for their code card they either tell me that they have never heard of this option or they have not been issued with it yet due to problems with their system (whatever that may mean). As I said, this is an excellent way to put a little extra cash in the pockets of people who are not very well paid. Perhaps their are labor issues and some employees feel that because they are not petrol attendants they are unable to benefit from the system? In this case perhaps Engen could come up with a means of "pooling" tips and dividing them equally among the whole staff? In any event, I feel that Engen is failing their staff in this matter. Either get the system working or remove the option from the app.