cart api operations from exernal application

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Currently i use shopify for my inventory and orders But also, I manage my catalogue, I create also the order directly from shopify, select different items and add, I can modify the order, i can create the invoice.
Basically, I collect orders on the phone from my clients and I enter them directly into Shopify. (without using the SDK)
I would like to know if i can do all above abovementioned actions via API calls?
For instance if I implement a chatbot and perform some cart operations via api calls?
Thanks in advance.