How to understand what data to use when creating a request?

Tell me what to read, in what direction to dig? The crux of the matter - how to create a query with all the data Headers from a page. There may be some Adon for chrome that intercepts the query and produces ready-to-use url?
General
Request URL:https://paytm.com/papi/v1/expresscart/verify?child_site_id=1&site_id=1
Request Method:POST
Status Code:200 OK
Remote Address:52.76.232.13:443
Referrer Policy:no-referrer-when-downgrade

Request
Accept:application/json, text/plain, */*
Accept-Encoding:gzip, deflate, br
Accept-Language:en-US,en;q=0.8,EN;q=0.6,uk;q=0.4
Connection:keep-alive
Content-Length:347
Content-type:application/json
Cookie:tvc_vid=11491574166230; _ampUITN=a842e40b6fbotc172df255ace-30268-1491574173408; _ampCon=Ukraine; _ampCity=Okhtyrka; _gat_UA-36768858-14=1; queenoftarts=pawslmktshopapp70; XSRF-TOKEN=RJNjh19N-DRvrN7QTrs8DwniA7wMVBkToge0; referrer=; _gat=1; _dc_gtm_UA-36768858-14=1; connect.sid=s%3AP_KeFp4GxWwyWUCPOgEk-d6tuQ5nX-md.w0UzRINL6Cn7x9qKtMlSHoUwkc7BJTGCobkj3pkigte; AWSELB=97B3358B1C150AC96AC74F39ED34D289809132006F7BA5B2F25F07E55154F8085275EA0D2F39DF8BB21744F830D89ECD43579653C4FF809D5E4B391B26A44F45D1D2211304; _ampLog=1; _ampNV=1; _ga=GA1.2.1957467480.1491574166
DNT:1
Host:paytm.com
Origin:https://paytm.com
Referer:https://paytm.com/electricity-bill-payment
User-Agent:Mozilla/5.0 (Linux; Android 4.4.2; Nexus 4 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.114 Mobile Safari/537.36
X-XSRF-TOKEN:RJNjh19N-DRvrN7QTrs8DwniA7wMVBkToge0

Request payload
{"cart_items":[{"product_id":33683541,"qty":1,"configuration":{"recharge_number":"7108990480","price":10},"meta_data":{},"tracking_info":{"business_sub_vertical":"electricity","service_type":"postpaid","recharge_utilities_number":"7108990480","recharge_utilities_operator":"BESCOM","recharge_utilities_amount":10,"recharge_utilities_circle":""}}]}
June 27th 19 at 15:26
1 answer
June 27th 19 at 15:28
URL with POST request, no addon will not be given, and any requests formirovaniem
Some example? Postman? But how do I know what data to feed to him? and in what format? - Rebekah.Kilback11 commented on June 27th 19 at 15:31
fiddler - Juanita17 commented on June 27th 19 at 15:34

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