How to create a more maintainable SOAP in Postman?

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I have a FedEx API “quote rate” post-action in SOAP, but how do I make it more maintainable?

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I cannot break these things into smaller steps because FedEx doesn’t accept it but maybe just replace variables. Is there something else I can do?

Note: I tried learning SoapUI but it’s horrible and I still prefer postman like this