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the "missing deduplication parameters" error on facebook typically occurs during the implementation of facebook's conversions api or other advertising-related functionalities where deduplication is necessary. this error arises when a request sent to facebook lacks the required parameters to uniquely identify events, leading to ambiguity about whether an event is a duplicate.

what is deduplication?

deduplication is a process that ensures that duplicate events are not counted multiple times. for instance, if a user completes a purchase on your website and your server sends two identical events to facebook, deduplication ensures that only one of those events is counted.

key parameters for deduplication

to effectively deduplicate events, you typically need the following parameters:

1. **event_id**: a unique identifier for the event. this should be unique for each event that you send.

2. **event_time**: the time when the event occurred. this should be a unix timestamp.

how to implement deduplication

to avoid the "missing deduplication parameters" error, ensure that you are including the `event_id` and `event_time` parameters in your api request.

example of sending events to facebook conversions api

below is an example of how to send an event to the facebook conversions api with the necessary deduplication parameters using python.

step 1: install necessary library

if you haven't already, install the `requests` library to make http requests:



step 2: code example

here's a python code snippet that sends a purchase event with deduplication parameters:



explanation of the code

1. **uuid generation**: a unique `event_id` is generated using python's `uuid` library to ensure that each event can be uniquely identified.

2. **time capture**: the current time is captured in unix timestamp format using `time.time()`.

3. **event structure**: the data dictionary contains the event details, including `event_name`, `event_time`, `event_id`, `user_data` (ha ...

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