making a POST call to the /contacts/sign_up_form endpoint. WITHOUT OAUTH

When submitting an internal form, our users are asked if they also want to subscribe to our CC newsletter.

Is there a way to do submit their email, (create a contact), without going through the rigamroll of the OAUTH process?  The simple CC inline form performs this function, but there is no visible way to just make the same post without the embedded form.

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