1. A method, the method comprising: presenting, using a user interface, in a transactional workflow driver (TWD), a visual representation of a legacy application; identifying, using the TWD, from the visual representation of the legacy application, legacy application processing components and legacy application execution patterns; presenting, using the TWD, a visual representation of extender processing components; identifying, using the TWD, by comparing the legacy application processing components with requirements for a target application, one or more extender processing components from the visual representation of the extender processing components that extend the legacy application to generate: the target application; and extender execution patterns defined by the extender processing components; selecting the one or more extender processing components from an extender processing components repository; ordering into an execution sequence the one or more extender processing components and the legacy application execution patterns; generating and storing, in a memory coupled to a processor, a target application processing vector that represents the ordering of the legacy application execution patterns with the extender execution patterns; executing, using the processor, the target application processing vector to perform features defined by a target execution pattern; deploying the target application with one or more service request message application program interfaces (APIs) for one or more transaction servers or transaction managers; managing user interactions with the target application, using the one or more service request message APIs to satisfy service request messages responsive to the user interactions; receiving, using the TWD, a user interaction for the target application through the one or more service request message APIs; translating, using the TWD, the user interaction into a target application service request message for the target application processing vector associated with the legacy application processing components and the one or more extender processing components; identifying, using the TWD, which of the legacy application processing components or the one or more extender processing components to which to communicate the target application service request message; and communicating, using the TWD, the target application service request message to the identified legacy application processing component or the identified one or more extender processing component; executing, using the TWD, the identified legacy application processing component or the identified one or more extender processing component responsive to the target application service request message; receiving, using the TWD, a return code from the identified legacy application processing component or the identified one or more extender processing component; determining, using the TWD, whether the return code includes: a result; or a subsequent processing component reference to another legacy application processing component or another one or more extender processing component; and in instances when the return code includes the result, communicating, using the TWD, the return code in a service request response message through the one or more service request message APIs to a user.