I am doing purchase order integration from my platform to acumatica so i need to pass my Product items from my platform to the purchase order creation in acumatica.

For example i choose the 1st , 2nd and 3rd checkbox of select products , i choose a vendor now i hit the api so i am asking how will i send these products in my Purchase order create api and where will i see these Products name in my purchase order ? these products that are in the product name by selecting a vendor so where will be these product will be added or from where i can see these products in my Purchase Order in acumatica.