How can I use a fixture in my pytest project to pass in sub sequent methods

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Python3.3

For Example-
step1-For every api call we need to encrypt the payload with the help of encrypt API

step 2- This output of encrypt API will pass as payload of another API(say Login API)

Step 3- Again for another API say(logout API), I need to encrypt the plain text payload and use the encrypted payload as input payload for logout API

My approach is like

@pytest.fixture()
def setup():
    payload = {
        "userName": "7978130592",
        "password": "Test@123",
        "SessionId": "abc123",
        "version": "1620"
    }
url = "http://101.15.101.256:443/encrypt" 
response = requests.request("POST",url,headers=headers,data=json.dumps(payload))

python_response = json.loads(response.text)
jsonpath_data = parse("$.data")
data =(jsonpath_data.find(python_response)[0].value)
return data

def test_login(setup):

    headers = {
        'Content-Type': 'application/json',
            }
url = "https://testsite.com/users/Login"
    payload = setup

    response = requests.request("POST",url=url,headers=headers,data=payload)

and for logout API payload is like below and i want to encrypt this paylaod by using encrypt API which is defined as method for fixture.

{

"deviceId": "goldfishx86", 
"user": "xyz", 
"isGpsEnabled": "Y"
}

My query here is how can I replace my different payload again and again in same method so that I use the output in different API call

What I have tried:

Please help me, I tried but could not succeed to use different payload as input of fixture method

@pytest.fixture()
def setup():
    payload = {
        "userName": "7978130592",
        "password": "Test@123",
        "SessionId": "abc123",
        "version": "1620"
    }
url = "http://101.15.101.256:443/encrypt" 
response = requests.request("POST",url,headers=headers,data=json.dumps(payload))

python_response = json.loads(response.text)
jsonpath_data = parse("$.data")
data =(jsonpath_data.find(python_response)[0].value)
return data

def test_login(setup):

    headers = {
        'Content-Type': 'application/json',
            }
url = "https://testsite.com/users/Login"
    payload = setup

    response = requests.request("POST",url=url,headers=headers,data=payload)

def test_logout(setup):
payload = 
{

"deviceId": "goldfishx86", 
"user": "xyz", 
"isGpsEnabled": "Y"
}

url = "https://testsite.com/users/Logout"
response = requests.request("POST", url, headers=headers, data=json.dumps(payload))