Floom discount debug

gistfile1.txt

£43.99
ch_1A4WhUJOG9s44O5lPIPAvEhD

https://dashboard.stripe.com/payments/ch_1A4WhUJOG9s44O5lPIPAvEhD

Transaction with an 18% discount
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Ratable total (products) : £45.00
Total discount: 18% of £45.00 == £8.10
Total rateable after discount = £36.90

Delivery: £6.99

Customer Paid: 45.00 + 6.99 - 8.10 = £43.89

A. Floom standard fee (if there were no discount) @20% = 45 * 0.2 = £9
B. Floom application fee of 20% : (45 - 8.10) * 0.2 = £7.38


Merchant expected payout: 
  = (product + delivery - floom fee) 
  = 45 + 6.99 - 9 
  = £42.99

Merchant actual payout (case B) : 
  = (product(adjusted) + delivery - floom fee(adjusted)) 
  = 36.90 + 6.99 - 7.38
  = £36.51

Merchant Underpayment: 
  = Expected - Actual
  = 36.51 - 42.99
  = £-6.48
  
Merchant made up total: 
  = Actual + Makeup payment
  = 36.51 + 6.48
  = £42.99