Call tax engine from third party for calculating tax on AR invoice, without creating invoice

Summary:

We need to calculate tax on a transaction in Salesforce, without actually creating an AR transaction. SO, the order is created in Salesforce. It must have a tax amount calculated by Oracle tax engine. There may be changes to the order before it is final and tax must change accordingly. Once final, the order data should be sent to Oracle Invoice Interface.

We are not sure if it is possible to call tax engine without actually creating an AR invoice. Any insight will be helpful.

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