Szablon danych dotyczących obsługi płatności

import requests
import json
import time
import hmac
import hashlib
import base64
import uuid
import pandas as pd
from datetime import datetime, timedelta

class=class="hl-string">"hl-comment"># ==========================================
class=class="hl-string">"hl-comment"># CONFIGURATION
class=class="hl-string">"hl-comment"># ==========================================
API_KEY = class="hl-string">"YOUR_API_KEY"
API_SECRET = class="hl-string">"YOUR_API_SECRET"
BASE_URL = class="hl-string">"https://cert.api.fiservapps.com"  class=class="hl-string">"hl-comment"># Update to Production URL as needed
ENDPOINT = class="hl-string">"/ch/payments/v1/transaction-inquiry"
START_DATE = class="hl-string">"2023-01-01"
END_DATE = class="hl-string">"2023-01-31"
PAGE_SIZE = 50
OUTPUT_FILE = class="hl-string">"fiserv_event_log.csv"

class=class="hl-string">"hl-comment"># ==========================================
class=class="hl-string">"hl-comment"># AUTHENTICATION HELPER
class=class="hl-string">"hl-comment"># ==========================================
def generate_headers(payload):
    class=class="hl-string">"hl-comment"># Fiserv Commerce Hub typically requires HMAC auth
    class=class="hl-string">"hl-comment"># This is a standard implementation pattern
    client_request_id = str(uuid.uuid4())
    timestamp = str(int(time.time() * 1000))
    
    class=class="hl-string">"hl-comment"># specific signature construction depends on Fiserv documentation version
    class=class="hl-string">"hl-comment"># standard pattern: apiKey + reqId + timestamp + payload
    raw_signature = API_KEY + client_request_id + timestamp + payload
    
    hmac_obj = hmac.new(
        API_SECRET.encode(class="hl-string">'utf-8'),
        raw_signature.encode(class="hl-string">'utf-8'),
        hashlib.sha256
    )
    message_signature = base64.b64encode(hmac_obj.digest()).decode(class="hl-string">'utf-8')
    
    return {
        class="hl-string">"Content-Type": class="hl-string">"application/json",
        class="hl-string">"Client-Request-Id": client_request_id,
        class="hl-string">"Api-Key": API_KEY,
        class="hl-string">"Timestamp": timestamp,
        class="hl-string">"Message-Signature": message_signature
    }

class=class="hl-string">"hl-comment"># ==========================================
class=class="hl-string">"hl-comment"># PARSING LOGIC (UNPIVOTING EVENTS)
class=class="hl-string">"hl-comment"># ==========================================
def extract_events_from_transaction(tx):
    events = []
    
    class=class="hl-string">"hl-comment"># Base Attributes
    case_id = tx.get(class="hl-string">"transactionId", class="hl-string">"")
    amount = tx.get(class="hl-string">"amount", {}).get(class="hl-string">"total", 0.0)
    currency = tx.get(class="hl-string">"amount", {}).get(class="hl-string">"currency", class="hl-string">"USD")
    method = tx.get(class="hl-string">"paymentMethod", {}).get(class="hl-string">"type", class="hl-string">"Unknown")
    payer_acc = tx.get(class="hl-string">"paymentMethod", {}).get(class="hl-string">"maskedAccountNumber", class="hl-string">"")
    class=class="hl-string">"hl-comment"># Identifying common attributes
    base_data = {
        class="hl-string">"PaymentTransactionId": case_id,
        class="hl-string">"SourceSystem": class="hl-string">"Fiserv Commerce Hub",
        class="hl-string">"LastDataUpdate": datetime.utcnow().isoformat(),
        class="hl-string">"PaymentAmount": amount,
        class="hl-string">"CurrencyCode": currency,
        class="hl-string">"PaymentMethod": method,
        class="hl-string">"PayerAccountNumber": payer_acc,
        class="hl-string">"PayeeAccountNumber": class="hl-string">"MerchantAccount", class=class="hl-string">"hl-comment"># Placeholder
        class="hl-string">"ErrorCode": tx.get(class="hl-string">"processorResponseDetails", {}).get(class="hl-string">"responseCode", class="hl-string">""),
        class="hl-string">"IsStraightThroughProcessing": class="hl-string">"True" class=class="hl-string">"hl-comment"># Default assumption unless error found
    }

    class=class="hl-string">"hl-comment"># Helper to append event
    def add_event(activity, timestamp_str, specific_attrs={}):
        if timestamp_str:
            row = base_data.copy()
            row.update({
                class="hl-string">"ActivityName": activity,
                class="hl-string">"EventTimestamp": timestamp_str
            })
            row.update(specific_attrs)
            events.append(row)

    class=class="hl-string">"hl-comment"># 1. Payment Request Created (Submission Time)
    submission_time = tx.get(class="hl-string">"submissionTime")
    add_event(class="hl-string">"Payment Request Created", submission_time)

    class=class="hl-string">"hl-comment"># 2. Payment Details Validated (Inferred: slightly after submission if no immediate 400 error)
    class=class="hl-string">"hl-comment"># We infer this exists if the transaction exists and has a submission time
    if submission_time:
        class=class="hl-string">"hl-comment"># Infer validation happened 1 second after submission
        val_time = (datetime.fromisoformat(submission_time.replace(class="hl-string">'Z', class="hl-string">'+00:00')) + timedelta(seconds=1)).isoformat()
        add_event(class="hl-string">"Payment Details Validated", val_time)

    class=class="hl-string">"hl-comment"># 3. Payment Error Identified / 4. Resolved
    status = tx.get(class="hl-string">"transactionStatus", class="hl-string">"")
    if status == class="hl-string">"FAILED":
        fail_time = tx.get(class="hl-string">"processorResponseDetails", {}).get(class="hl-string">"responseTimestamp", submission_time)
        add_event(class="hl-string">"Payment Error Identified", fail_time, {class="hl-string">"IsStraightThroughProcessing": class="hl-string">"False"})
    elif status == class="hl-string">"APPROVED" and tx.get(class="hl-string">"retryCount", 0) > 0:
        class=class="hl-string">"hl-comment"># Logic: If approved but had retries, an error was resolved
        add_event(class="hl-string">"Payment Error Resolved", submission_time) class=class="hl-string">"hl-comment"># Simplified assumption

    class=class="hl-string">"hl-comment"># 5. Payment Approved
    approval_time = tx.get(class="hl-string">"approvalTime")
    if approval_time:
        add_event(class="hl-string">"Payment Approved", approval_time)

    class=class="hl-string">"hl-comment"># 6. Payment Authorized
    auth_time = tx.get(class="hl-string">"authorizationTime")
    class=class="hl-string">"hl-comment"># If separate auth time not provided, use approval time
    if not auth_time and approval_time:
        auth_time = approval_time
    add_event(class="hl-string">"Payment Authorized", auth_time)

    class=class="hl-string">"hl-comment"># 7. Payment Scheduled (if future dated)
    req_exec_date = tx.get(class="hl-string">"requestedExecutionDate")
    if req_exec_date and req_exec_date > submission_time:
         add_event(class="hl-string">"Payment Scheduled", submission_time)

    class=class="hl-string">"hl-comment"># 8. Payment Instruction Sent
    gateway_time = tx.get(class="hl-string">"gatewayTransmitTime")
    add_event(class="hl-string">"Payment Instruction Sent", gateway_time)

    class=class="hl-string">"hl-comment"># 9. Payment Confirmed (Gateway ACK)
    gateway_ack = tx.get(class="hl-string">"gatewayAckTime")
    add_event(class="hl-string">"Payment Confirmed", gateway_ack)

    class=class="hl-string">"hl-comment"># 10. Payment Settled
    settle_time = tx.get(class="hl-string">"settlementTime") or tx.get(class="hl-string">"fundingDate")
    add_event(class="hl-string">"Payment Settled", settle_time)

    class=class="hl-string">"hl-comment"># 11. Payment Notification Sent (Inferred or specific field)
    notify_time = tx.get(class="hl-string">"customerNotificationEmailTime")
    add_event(class="hl-string">"Payment Notification Sent", notify_time)

    class=class="hl-string">"hl-comment"># 12. Payment Reconciled
    recon_time = tx.get(class="hl-string">"reconciliationDate")
    add_event(class="hl-string">"Payment Reconciled", recon_time)

    class=class="hl-string">"hl-comment"># 13. Payment Cancelled
    if status == class="hl-string">"VOIDED" or status == class="hl-string">"CANCELLED":
        void_time = tx.get(class="hl-string">"voidTime") or tx.get(class="hl-string">"lastUpdateTime")
        add_event(class="hl-string">"Payment Cancelled", void_time)

    return events

class=class="hl-string">"hl-comment"># ==========================================
class=class="hl-string">"hl-comment"># MAIN EXTRACTION LOOP
class=class="hl-string">"hl-comment"># ==========================================
def main():
    all_events = []
    page_number = 1
    has_more = True
    
    print(fclass="hl-string">"Starting extraction from {START_DATE} to {END_DATE}...")

    while has_more:
        class=class="hl-string">"hl-comment"># Construct Search Payload
        payload_dict = {
            class="hl-string">"startDate": START_DATE,
            class="hl-string">"endDate": END_DATE,
            class="hl-string">"page": page_number,
            class="hl-string">"limit": PAGE_SIZE
        }
        payload_json = json.dumps(payload_dict)
        
        headers = generate_headers(payload_json)
        full_url = BASE_URL + ENDPOINT
        
        try:
            response = requests.post(full_url, headers=headers, data=payload_json)
            
            if response.status_code == 200:
                data = response.json()
                transactions = data.get(class="hl-string">"reports", []) class=class="hl-string">"hl-comment"># Key depends on specific endpoint schema
                
                if not transactions:
                    print(fclass="hl-string">"No transactions found on page {page_number}. Finishing.")
                    has_more = False
                    break
                
                print(fclass="hl-string">"Processing page {page_number}, found {len(transactions)} transactions.")
                
                for tx in transactions:
                    events = extract_events_from_transaction(tx)
                    all_events.extend(events)
                
                class=class="hl-string">"hl-comment"># Pagination Check
                total_pages = data.get(class="hl-string">"totalPages", page_number)
                if page_number >= total_pages:
                    has_more = False
                else:
                    page_number += 1
            else:
                print(fclass="hl-string">"Error fetching data: {response.status_code} - {response.text}")
                has_more = False
                
        except Exception as e:
            print(fclass="hl-string">"Exception occurred: {str(e)}")
            has_more = False

    class=class="hl-string">"hl-comment"># ==========================================
    class=class="hl-string">"hl-comment"># EXPORT TO CSV
    class=class="hl-string">"hl-comment"># ==========================================
    if all_events:
        df = pd.DataFrame(all_events)
        class=class="hl-string">"hl-comment"># Column ordering
        cols = [
            class="hl-string">"PaymentTransactionId", class="hl-string">"ActivityName", class="hl-string">"EventTimestamp", 
            class="hl-string">"SourceSystem", class="hl-string">"PaymentAmount", class="hl-string">"CurrencyCode", class="hl-string">"PaymentMethod",
            class="hl-string">"PayerAccountNumber", class="hl-string">"ErrorCode", class="hl-string">"IsStraightThroughProcessing"
        ]
        class=class="hl-string">"hl-comment"># Ensure columns exist even if empty
        for c in cols:
            if c not in df.columns:
                df[c] = None
                
        df = df[cols]
        df.to_csv(OUTPUT_FILE, index=False)
        print(fclass="hl-string">"Extraction complete. {len(df)} rows written to {OUTPUT_FILE}")
    else:
        print(class="hl-string">"No events extracted.")

if __name__ == class="hl-string">"__main__":
    main()