Merges two TSVs based on a common key-field. Keeps all the rows from TsvA (left table) and brings in any matching rows from TsvB (right table); Left Outer Join. Neither TSV needs to be sorted. Only the upper row in TsvB will be matched.
Invoice and billing
An independent subprocess to be invoked by various business flows. Through “PayPal Invoicing API”, 1) let PayPal generate “PayPal Invoice”, 2) let PayPal send “PayPal Invoice”, 3) confirm payment status of “PayPal Invoice” to PayPal. Also generates “Transfer slip CSV” for accounting system automatically.