Looking for WEB API Developer to skip some validation checks perfomed by the WEB API.

My requirements here

I am executing an web API. It's 3rd party website and i am not the owner and nor i am having its source code.

Web api purpose - To transfer the balance from 1 account to another account by doing the validation checks of available balance of source account

So at present what's happening.

I have balance as 100.

I am executive API for transferring balance of 50. Running it 4 times

So all api status is getting completed with 200 status code and it generates some reference number.

So only 2 reference number is in Done status and remaining 2 went to Rejected status as the balance became zero.

So am not sure whether it's calling any other child API or not or may be some javascript in hidden mode

So I would like to skip the validation checks