How to create a unique random number after form submission?

Dear all,
I want to do a RMA form, so when a customer needs to return a faulty product, completes the form and our company receives the formulaire.
So far, so good.
I also need that, once RMA form is submitted, an unique number be assigned to that request...
So our customer receives an email like: "Your RMA number is XXXXXX, please write it at every product you send".
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And our Technical Department receives an email like "Customer XX has created an RMA and the following number was assigned XXXXXX".
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I can do the form, all good, but have no clue on how to generate random number to suit this application.
I'm using ChronoForms6.
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Thanks in advance !!!

You can generate a random number with the {rand:} shortcode, but, you will need to store this number in a variable using the "data builder" action, then call it later in any place you need using the {var:var_name} shortcode, you better store it in the database table as well!
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Best regards

Dear Max,
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Thanks a lot for your kind answer.
Is there any guide or document to achieve my request?
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I'm new with Chronoforms, so the "data builder" action and even the database set is something that still is not familiar to me.
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Again, many thanks in advance !

There's a database read / save demo form.
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As for the data builder action, just have a look at it and see how you go.