Trying to get all Cards

Hey Paulo, how are you? 

You’re missing some escaping in your query.

Here an example in Python with the after parameter:

import requests

url = "https://api.pipefy.com/graphql"

payload = {"query": "{   allCards(pipeId: 301315434, after:\"WyIyLjAiLCI0LjAiLDM3NDc2MjcyNV0\") {     edges {       node {         id         title         fields {           name           report_value           updated_at           value         }       }     }     pageInfo {       endCursor     }   } }"}
headers = {
    "authorization": "Bearer YOUR_TOKEN",
    "content-type": "application/json"
}

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

print(response.text

If you have doubts about escaping, we have a console in Pipefy Developers page where you can input a query and have examples in Python, Ruby, JS, Node, cURL with it’s respective escaping. 

https://developers.pipefy.com/reference#graphql-endpoint

Hope it helps you =D