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Find pattern for Check Digit calculation

I need to solve the calculation that produces the check digit for BPAY payment numbers.

I've found multiple references, all of which state a slightly different method to calculate it, but none of them give the same results as the test data I have.

I've been told it's to use Modulus 10 Version 5, or the Luhn algorithm to calculate it, but as mentioned it does not, so it must be a custom algorithm.

The start of the number is the biller ID so I am not sure if that needs to be taken into account or now, but here are some examples and their check digits. Upon solving these I will provide some more test data to verify.

1018 5122 | 9900 4184 | 6

1018 5122 | 9900 4185 | 9

1018 5122 | 9900 3887 | 4

1018 5122 | 0020 4935 | 1

1018 5122 | 0020 4874 | 5

Habilidades: Algoritmo, Ciência de Dados, Engenharia, Matemática

Sobre o Cliente:
( 173 comentários ) PESHAWAR, Pakistan

ID do Projeto: #8705102

2 freelancers estão ofertando em média $12/hora nesse trabalho

polaris0621

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