I answered a similar questions here:
There are several steps, approvals, and integrations you’ll need to make so you can starting posting to your user’s social networks. It sounds like you’ve begun on the right path with creating apps at Facebook and Twitter. Realize this is an old post, but in case you or other still want to solve it.
disclosure: my company Ayrshare has a Social Media Posting Bubble Plugin and API Connector that does most of the following for you. See below.
While each network has their own flow , API, and gotch…
Let me know if you need more help on the Instagram API. Basically Facebook and IG are the same process to get approval with slightly different API calls and scope permissions.
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