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StepFunctions can be invoked from API Gateway so you can have an API that invokes a state machine, that performs several steps. Step Functions can also have Task states that makes calls to API Gateway.
So the short answer is yes, you can use Step Functions to coordinate several API calls.
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Thanks for your response. In my use case, all these APIs (account [1], profiles [2], orders [3] and prices [4]) must be called in Synchronous fashion and orchestrator should wait for response before calling next target API in-line. For ex., account API returns an identifier which must be used to link it profiles and orders while calling those API. Also, orders API returns order line references which must be linked to prices while calling Price API
Unfortunately, my target system does not the callback capability. So, orchestrator should initiate these 4 API calls in Sync fashion and use the returned response while calling next API in-line
So just use Task states, one after the other, each one making a call to API Gateway.