CodeView of a LogicApp dynamically referring to the API Connection to be used, based on a value from a HTTP Header from the inbound request.

CodeView_LogicApps_2APIConnections.json

{
    "$connections": {
        "value": {
            "FirstAPI": {
                "connectionId": "/subscriptions/<subscriptionId>/resourceGroups/LogicApps_APIConn/providers/Microsoft.Web/connections/FirstAPI",
                "connectionName": "FirstAPI",
                "id": "/subscriptions/<subscriptionId>/providers/Microsoft.Web/locations/northeurope/managedApis/ftp"
            },
            "SecondAPI": {
                "connectionId": "/subscriptions/<subscriptionId>/resourceGroups/LogicApps_APIConn/providers/Microsoft.Web/connections/SecondAPI",
                "connectionName": "SecondAPI",
                "id": "/subscriptions/<subscriptionId>/providers/Microsoft.Web/locations/northeurope/managedApis/ftp"
            }
        }
    },
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "Create_file": {
                "inputs": {
                    "body": "@triggerBody()",
                    "host": {
                        "connection": {
                            "name": "@parameters('$connections')[triggerOutputs()['headers']['APIConnectionName']]['connectionId']"
                        }
                    },
                    "method": "post",
                    "path": "/datasets/default/files",
                    "queries": {
                        "folderPath": "@{triggerOutputs()['headers']['Folder']}",
                        "name": "@{triggerOutputs()['headers']['FileName']}"
                    }
                },
                "runAfter": {},
                "runtimeConfiguration": {
                    "contentTransfer": {
                        "transferMode": "Chunked"
                    }
                },
                "type": "ApiConnection"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {
            "$connections": {
                "defaultValue": {},
                "type": "Object"
            }
        },
        "triggers": {
            "manual": {
                "inputs": {
                    "schema": {}
                },
                "kind": "Http",
                "type": "Request"
            }
        }
    }
}