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Join of data from Account to Invoice to Payment

I am trying to determine how the data is linked to determine the Payment of an Invoice and how it is linked to the Account data?

 

ie:  AcountNumber > Invoice.AccountNumber, to some id of the Payment data.

 

This is a urgent need can someone help me by pointing me to the right person or notes to explain this connections of data?

 

Thanks,

 

kfschaefer