I see there are ways to create, delete, read individual opportunities here: https://developer.salesforce.com/docs/api-explorer/sobject/Opportunity
How to get all opportunities owned by a salesforce account using their rest api?
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1Welcome to SFSE. Please take a moment to go through How to Ask and then edit your question to provide more details. It seems you want to query all opportunities associated to an account using REST API. If that's the case, please edit your question, in its current form, your question does not specify any issue. – Jayant Das Oct 30 '18 at 3:14
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Assuming you need to fetch all Opportunities associated to an Account, you can just use Query resource for this purpose.
In your case, your API call should look like:
https://yourinstance.salesforce.com/services/data/v43.0/query?q=select+name+from+opportunity+where+accountid='<the account id>'
