How to Integrate Zoho Inventory with 3rd party app (PHP website)

How to Integrate Zoho Inventory with 3rd party app (PHP website)

We are an authorized partner with Zoho and we have a client, who wants to integrate their PHP website with the Zoho Inventory and Books. We tried hard but couldn't achieve success.
We want to integrate the Zoho inventory with the PHP website (2-way sync) for our client. How can we achieve this?
I searched for the solution on google on every site, read all the articles but couldn't find the solution so kindly helps me out with this, it is an important and urgent issue for me.

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