how to create new custom Business Number Checksum algorithm

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Hi fellow community,

We have a requirement by a client where they want to transform their custom Business Number Checksum algorithm ( written and derived using PL-SQL ) in OTM on-premise to cloud. The client is expecting the functionality to work as it is and that would require us to create custom Business Number checksum algorithm. We checked all the native algorithms and none of them seem to be able to transform their logic.

1. Can we create custom BN checksum algorithm in OTM cloud or do you need to use one of the six available algorithms ?

2. Is there any documentation or steps available for reference and guidance ?