REST API or Web Service to load the Corporate Card Transactions

Summary:

In EBS R12 we had the flexibility of creating our own loader programs to upload non-standard data into the Credit Card Transactions tables and make it available to consume within the expense module. However with Expense cloud this option is gone with the lack of having any REST API's or other mechanism to load the card transactions to be used by the end users

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We are implementing Fusion Cloud and expecting same functionality. Please advise how can we achieve the functionality in Oracle Cloud