Get Gatling Authentication Token

I am trying to use Gatling to test my API, but I have a problem. Now I am testing login / logout. Upon entering the system, the user received a token, which is used to exit the system.
When I use the recorder, it saves the fix token, and of course it does not work when I run the test. But I can not find in a document or Google how I can get a dynamic token.
Somebody knows?
Thank!

EDIT:

after writing here what i got

val headers_13 = Map(
        "Accept" -> """*/*""",
        "Origin" -> """http://site.com""",
        "token" -> """token"""
)

val scn = scenario("Scenario Name")
        .exec(http("request_1")
                    .post("http://site.com/login")
                    .headers(headers_1)
                        .param("""player[email]""", """email@address.com""")
                        .param("""player[password]""", """password""")
            )
        .pause(757 milliseconds)

...

.exec(http("request_13")
                    .get("http://site.com/logout")
                    .headers(headers_13)
            )
        .pause(202 milliseconds)

I am trying to put two snippets of code after .post (" http://site.com/login ") and .get (" http://site.com/logout "), but this does not work