Sage 50c API for integration for transactions and ledger accounts

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Our client , has an integration request between their Cloud hosted Pastel Partner v19 and a Web Application that they use for online sales and transactions. Ideally, the
application needs to pull accounts and transactional data from Pastel Partner v19 and we need guidance in how we can activate APIs to allow this integration.

We will be working with the application developers as we are the current Pastel administrators and need to get a perspective of how we can go about this exercise.

Please share the API's for pulling transactions and ledgers and how to connect or test in Postman.

Thank you.