Feature/#80 payment logic update #68

All 20 tests pass in 1s

20 tests +20 20 ✔️ +20 1s ⏱️ -1s
  7 suites +  7   0 💤 ±  0
  7 files +  7   0 ❌ ±  0

Results for commit 7a53bed. ± Comparison against earlier commit 5323839.