Three things that will always be true.
How the margin works
ZenvaPay is a distribution business. We buy airtime, data, bills, exam PINs and gift cards from licensed providers and resell them, and the difference is our revenue. That difference is recorded as its own entry in the ledger at the moment the purchase settles, in the same balanced entry as the purchase itself — which is why it cannot be applied as a surprise afterwards.
Reserving the full amount before we call a provider is a deliberate part of the same design: what leaves your wallet is decided before the purchase is attempted, not after it succeeds. Our rates for each product are not published yet.