How to iniciate process model to go external and then back?

Question

Hi,

i have a created process model but i don't know how to start my process in way like this:

when i start process (appiancloud.com/suite/designer ->processes) i have a reflection in tempo in tasks and see task with name of certain step that i used in created process model but...
how to start process by go to external website (to fill some fields like basic client data etc.) and then back to appian to further steps in this process model?

Can i write an expression in process start form (in start node) for example:

a!linkField(
label: "Article Request",
links: a!safeLink(
label: "Article Request",
uri: "http://SomeWebsiteWhereWeCanAddClientOrSomething"
)
)

rohitr303 · Answer

My suggestion in this case will be to expose your process model as a web api and then instead of calling the external site from the process model . Call the process model from the external site once that form is submitted . 
 
Hope this helps.