Architect transfer from flow to secure flow using a collection variable

I'm trying to transfer a call with a variable collection to be transferred to a secure flow to take a payment.
A variable collection is created in the calling flow named Task.combinedInvocationData and contains 13 variables I need in the Secure Flow concatenated like this: Flow.agreementID + "|" + Flow.accountID + "|" + Flow.title + "|" + etc. In the Secure Flow invocation data I then put this variable to be passed to the secure flow.

In the Secure Flow I then try to split this back into the required variables, like I do when passing data between non-secure call flows by creating a String collection with the Flow.combinedInvocationData name and separate the stings using the Split(Flow.InvocationData,"|") value, however I get an error stating: "at position 20 : There is no implementation that accepts parameters of Integer and String" when I try to assign the variables. I can't find a decent description on the resource centre on how to do this. Can someone advice me please?

Many thanks in advance
Ruud

Resolved this.

I found out that you first need to publish and link it to the calling flow before you can actually create the variables based on the collection.

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