How to display certain values ​​through the AMOCRM API?

Question

Python

Hello. I want to display in a separate df several lines by a certain value.
The request itself: https://############.amocrm.ru/api/v2/leads?query=...
The problem is that the values ​​I need may not always be in the same place . For example:

'ID курса' : testdata['_embedded']['items'][i]['custom_fields'][3]['values'][0]['value']
# будет находится не здесь, а например в 
'ID курса' : testdata['_embedded']['items'][i]['custom_fields'][4]['values'][0]['value']

Before I understood this, I wrote the code, but as you can see, not in all cases it will produce the necessary fields (screen in red):

rows_list = []
for i in range(len(testdata['_embedded']['items'])):
    dict1 = {}
    # Так как в custom_fields нужно не менее 5 полей
    if len(testdata['_embedded']['items'][i]['custom_fields']) > 4:
        dict1.update({'ID курса' : testdata['_embedded']['items'][i]['custom_fields'][3]['values'][0]['value'],
                      'Этап сделки' : testdata['_embedded']['items'][i]['status_id'],
                      'ClientID' : testdata['_embedded']['items'][i]['custom_fields'][4]['values'][0]['value']})
        rows_list.append(dict1)
        
df1 = pd.DataFrame(rows_list) 
print(df1)

From what I noted, I found that each field has a unique id, but in order to get close to it, it still turns out that the values ​​\u200b\u200bare always located in one place. (screen 2). Here he is in 3rd place, but in another transaction he may be in 4th or 5th, and so on.