API Intergrations and Jira capability

[Troy Edmonds]

Hello I have a question about the feasibility  and help on API 

We want to go from 

Jira portal form>to a jira ticket> that triggers the API to create a request on a JSON-based system

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that external system sends a quote of material in JSON or PDF that requires customer approval on the Jira portal

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the customer signs off on the quote using the jira portal which triggers another event on an external json based system

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that creates multiple project documents for a construction project with sign-off on each document when completed

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those documents will be sent back to jira portal for customers to download or review 

jira needs to send the final pdf documents to a JSON-based archival system afterward then closes the project ticket 

is this doable in jira and its REST API without a lot of hassle 

thank you 

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no existing API interface exists yet but we have the API available for both products 

it uses the REST API