Whether you use a plugin to handle to creation and management of your forms or whether you create and maintain your forms manually, its pretty safe to say that any interaction with external APIs will require some custom coding in order to inter-operate with those APIs.
We’re also totally in the dark on this question too because you haven’t said what these APIs are/or who they belong to and what kind of data is being submitted and in what formats you are required to work with.
There is always a chance someone has created a plugin that makes interfacing with your external APIs but that’s usually for the more popular ones.
…so, we need more info!
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