Can't generate and use a value of some token within headers on the fly

I'm trying to create a script using requests module to fetch some content from a webpage. My intention is to get 200 status code when I send a post http requests with appropriate parameters. So, this is the site address and this is the form that I filled in to generate the results. I just chose two options from the two dropdowns within the from and hit the Select My vehicle button to populate the results.

The way I've tried below works only when I hardcode cookie and digital_token within the headers. Please note that the username and the password are static.

As the value of cookie and digital_token are dynamic, it is necessary to produce them on the fly, otherwise if I hardcode their values, they expire in few minutes.

How can I generate and use the value of digital_token on the fly?

I've tried with:

import requests
from bs4 import BeautifulSoup

base = 'https://www.avis.com.au/en/home'
URL = 'https://www.avis.com.au/webapi/reservation/vehicles'

payload = {"rqHeader":{"brand":"","locale":"en_AU"},"nonUSShop":False,"pickInfo":"SYD","pickCountry":"AU","pickDate":"26/01/2021","pickTime":"9:00 AM","dropInfo":"SYD","dropDate":"27/01/2021","dropTime":"9:00 AM","couponNumber":"","couponInstances":"","couponRateCode":"","discountNumber":"","rateType":"","residency":"AU","age":25,"wizardNumber":"","lastName":"","userSelectedCurrency":"","selDiscountNum":"","promotionalCoupon":"","preferredCarClass":"","membershipId":"","noMembershipAvailable":False,"corporateBookingType":"","enableStrikethrough":"true","picLocTruckIndicator":False}

headers = {
    'content-type': 'application/json',
    'cookie': 'JSESSIONID=7-PfFQTdLoe4Allx772MXjNRHg-proLZhT7Wkn5k.w04vprecmapp02; akaalb_production_config=~op=avis_au:avis-au-us-wdc|~rv=36~m=avis-au-us-wdc:0|~os=7f956ca2417c5e686d715889b6a30f65~id=227f46458e1d74f397bc3732493d29f5; SessionPersistence=PROFILEDATA%3A%3DauthorizableId%253Danonymous; datacenter=cwdc; visitorId=cwdc-A6dcb0c81-876f-4200-b8b4-cf01d6665ad9; _gcl_au=1.1.1537375693.1611743635; _ga=GA1.3.666679016.1611743635; _gid=GA1.3.1276090703.1611743635; IR_gbd=avis.com.au; _fbp=fb.2.1611743635775.709997675; __qca=P0-236558422-1611743636477; APISID=f4bf5c40-9387-4319-b347-67a23e62ef8a; DIGITAL_TOKEN=86c21933-e3fe-4867-855e-256991d6c099-02-cwdc-ho4905; IR_8968=1611781534175%7C0%7C1611781534175%7C%7C; _uetsid=27fa7d10608b11eb994047dca2e1810a; _uetvid=27faeca0608b11eb8fe3e90805023a70; _gat_UA-6997633-40=1',
    'digital_token': 'eyJjdHkiOiJKV1QiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiZGlyIn0..mPE_QHWlQV4uOqy6.3cB4yCaW_mvSRbigEXpvvB-Y_zxrixxddIdq0kzoNyQlJEGgsefnR-8cSHXxWgDWU6Tp5Wl6WFfOjfPETeh9gnFmQpokP2-vZ0pX6k288PAjqg7GbJoaiYo7fBsDAs3nQfu_lsRtvtoqh4ku5jptU8juVLYl7DuBzSs3KtmJobP6esWh8mrx0ezClpg1Qt0E4jpfmSYmCx0dbDgSyKYxp-fB3YD8DDBB1xrkCWFwCW4P4HQqtt6S1EYbW_FKsFmwI-wnyouSXfMXCCeEc8_Ib6PO1LBU3PaWfCGyzEW2M-Z8QeKLYXxp5GCmgQDRylm5JiVhIhWPDLh9TLcQGyWKABOR9wrM7FkUSUBh9fGX-O-HRc63AxDSZ5zn81Wo9roqPLt_BoAm-RYxbmSjxD298x8i10beEv8vu3IDjuqGmbldmEpvdST2gE_-KRKZAwKDcM8NCzU9LuG3Q3G6eSOJRL3jfMx37uqVpOSe9qMQEYBtMn_tUhKWmThsYLzvmH6bgvmCKaAwOgd2TzSI_kcieAidjOH-OJLEbJ9zrGNw6orGu6x7_UcC9r8fy5T8JbsNXrOFQE_LL3jkzNymlTXQRZOO51AOgoxuVrNJBM8TrzHftY7y5HVa_gQleLFG_uN_RGg3mr9fzKxjcGEHFt15RqqtY2V70LOEpQeKrPjC7B-D-UI0XHa3lOhBp3bIDz4tX-loFP3QOwn2e5Nmqk_O0pr9Lfzjbc0jnk-6iUIFsQzKl4G-eJwaUkN5n549BpeaFrpfwInNNloVdVTqDwGLYA-xcYnkNBozXFuNjkNwYjv66Zlwaj3_bC6sz-SySyu7rtwhdW85O8DREhj8I6xb-VvwDDGsb6-h0GgeCjGN7JZ4qkpZ4BvLyPu-YxeB6mz-xcO22-t9lyx8abABlm8oLdhOkYBDgA8x7exGzNMbUiDe_D61bsgnkTu6XIMKrm4HMOcT9ZsGcXkK2BZ909i_cXyTDpq26YLgTjEcH5Ob5NRC-eSAw4eeddDmeAxWlL4TixCESaKsbxC8sXRC7tURQDIasW6xLAAkVSTCnlkOV34luR3VOU6KaHvoa6RaAdKgFw5VXvCddFkhA_mqWhOO60Y1ow9wRWu65Z8M6VjqsU_rRvW8HMlfUqJ9I8EHQJ4yG3PcbNRxx4qzpXOs6TGsk9OMhQzPOaEoo4-hzaV4f54HeyZDFUx2gI8CEopbd1Shg1e0p1Mk0gEuM12550A--M6dvZ0oMLL4lv9XzEEe2mGy16gmiRsRkvEoFcumbM1XUuX3IkuCVHk9OcPNNlVPD2jIGT8prY8aHDP8aJ6wl0b1GtoiwDA6CAA9ePzRpLN4G617Wnotttmao5YVrcE_b1O0CQbfYqLQ_lPvTl1n4-P1p-YuiRwYAdw2BQEpOv0LyS1ekycEzWHN4-BOFr9MxQ.bZcUICoU7nJzaxeT0rENtg',
    'password': 'AVISCOM',
    'user-agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 Safari/537.36',
    'username': 'AVISCOM'
}

with requests.Session() as s:
    s.headers.update(headers)
    r = s.post(URL,json=payload)
    print(r.status_code)

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