EUID SDK for Python (Server-Side) Reference Guide

You can use the EUID SDK for Python (Server-Side) to facilitate:

• Generating EUID advertising tokens
• Refreshing EUID advertising tokens
• Decrypting EUID tokens to access the raw EUIDs

note

This SDK is valid for UID2 and EUID. Some of the code naming and URLs are labelled as UID2. These apply equally to EUID.

Functionality

This SDK simplifies integration with EUID for any DSPs who are using Python for their server-side coding. The following table shows the functions it supports.

Encrypt Raw EUID to EUID Token	Decrypt EUID Token	Generate EUID Token from Personal Data	Refresh EUID Token	Map Personal Data to a Raw EUID
Not Supported	Supported	Supported	Supported	Supported

API Permissions

To use this SDK, you'll need to complete the EUID account setup by following the steps described in the Account Setup page.

You'll be granted permission to use specific functions offered by the SDK, and given credentials for that access. Bear in mind that there might be functions in the SDK that you don't have permission to use. For example, publishers get a specific API permission to generate and refresh tokens, but the SDK might support other activities that require a different API permission.

For details, see API Permissions.

Version

The SDK supports Python 3.6 and above.

GitHub Repository/Package

This SDK is in the following open-source GitHub repository:

• EUID SDK for Python

The package is published in this location:

• https://pypi.org/project/uid2-client/

Initialization

The initialization step depends on the role, as shown in the following table.

Role	Create Instance of Class	Link to Instructions
Publisher	Uid2PublisherClient	Usage for Publishers
Advertiser/Data Provider	IdentityMapClient	Usage for Advertisers/Data Providers
DSP	BidstreamClient	Usage for DSPs
Sharer (not currently supported for EUID)	SharingClient	Not applicable

You will need to provide the values necessary for the SDK to authenticate with the EUID service.

Parameter	Description
base_url	The endpoint for the EUID service. See Environments.
auth_key	The API key. See EUID Credentials.
secret_key	The client secret. See EUID Credentials.

Interface

The BidstreamClient class allows you to decrypt EUID tokens into raw EUIDs.

For details on the bidding logic for handling user opt-outs, see DSP Integration Guide.

note

When you use an SDK, you do not need to store or manage decryption keys.

Decryption Response Content

Whether decrypting with the BidstreamClient class, the SDK returns the information shown in the following table.

Methods	Description
status	The decryption result status. For a list of possible values and definitions, see Decryption Response Statuses.
uid	The raw EUID for the corresponding EUID token.
established	The timestamp indicating when a user first established the EUID with the publisher.

Decryption Response Statuses

Decryption response codes, and their meanings, are shown in the following table.

Value	Description
SUCCESS	The EUID token was decrypted successfully and a raw EUID was returned.
NOT_AUTHORIZED_FOR_KEY	The requester does not have authorization to decrypt this EUID token.
NOT_INITIALIZED	The client library is waiting to be initialized.
INVALID_PAYLOAD	The incoming EUID token is not a valid payload.
EXPIRED_TOKEN	The incoming EUID token has expired.
KEYS_NOT_SYNCED	The client has failed to synchronize keys from the EUID service.
VERSION_NOT_SUPPORTED	The client library does not support the version of the encrypted token.
DOMAIN_NAME_CHECK_FAILED	The domain name doesn't match the domain of the encrypted token.
INVALID_TOKEN_LIFETIME	The token has an invalid timestamp.

Usage for Publishers

1. Create an instance of Uid2PublisherClient:

   client = Uid2PublisherClient(EUID_BASE_URL, EUID_API_KEY, EUID_SECRET_KEY)

2. Call a function that takes the user's email address as input and generates a TokenGenerateResponse object. The following example uses an email address:

   token_generate_response = client.generate_token(TokenGenerateInput.from_email(emailAddress).do_not_generate_tokens_for_opted_out())
   important

   • Be sure to call the POST /token/generate endpoint only when you have a legal basis to convert the user’s personal data to EUID tokens for targeted advertising.

   • Always apply do_not_generate_tokens_for_opted_out(). This applies a parameter similar to setting optout_check=1 in the call to the POST /token/generate endpoint (see Unencrypted JSON Body Parameters).

Client-Server Integration

If you're using client-server integration (see Client-Side Integration Guide for JavaScript), follow this step:

• Send this identity as a JSON string back to the client (to use in the identity field) using the following:

  token_generate_response.get_identity_json_string()
  note

  If the user has opted out, this method returns None, so be sure to handle that case.

Server-Side Integration

If you're using server-side integration (see Publisher Integration Guide, Server-Side):

1. Store this identity as a JSON string in the user's session, using the token_generate_response.get_identity_json_string() function.

   If the user has opted out, this method returns None, so be sure to handle that case.

2. To retrieve the user's EUID token, use the following:

   identity = token_generate_response.get_identity()
   if identity:
      advertising_token = identity.get_advertising_token()

3. Periodically check if the user's EUID token should be refreshed. This can be done at fixed intervals using a timer, or can be done whenever the user accesses another page:

   1. Retrieve the identity JSON string from the user's session, and then call the following function that takes the identity information as input and generates an IdentityTokens object:

      identity = IdentityTokens.from_json_string(identityJsonString)

   2. Determine if the identity can be refreshed (that is, the refresh token hasn't expired):

      if not identity or not identity.is_refreshable(): # we must no longer use this identity (for example, remove this identity from the user's session)

   3. Determine if a refresh is needed:

      if identity.is_due_for_refresh()):

4. If needed, refresh the token and associated values:

   token_refresh_response = client.refresh_token(identity)

5. Store token_refresh_response.get_identity_json_string() in the user's session.

   If the user has opted out, this method returns None, indicating that the user's identity should be removed from the session. To confirm optout, you can use the token_refresh_response.is_optout() function.

Usage for Advertisers/Data Providers

1. Create an instance of IdentityMapClient as an instance variable.

   client = IdentityMapClient(base_url, api_key, client_secret)

2. Call a function that takes email addresses as input and generates an IdentityMapResponse object. The following example uses email addresses:

   identity_map_response = client.generate_identity_map(IdentityMapInput.from_emails(["email1@example.com", "email2@example.com"]))

note

The SDK hashes input values before sending them. This ensures that raw email addresses do not leave your server.

3. Retrieve the mapped and unmapped results as follows:

   mapped_identities = identity_map_response.mapped_identities
   unmapped_identities = identity_map_response.unmapped_identities

4. Iterate through the mapped and unmapped results, or do a lookup. The following example does a lookup:

    mapped_identity = mapped_identities.get("email1@example.com")
    if mapped_identity is not None:
        raw_uid = mapped_identity.get_raw_uid()
    else:
        unmapped_identity = unmapped_identities.get("email1@example.com")
        reason = unmapped_identity.get_reason()

Usage for DSPs

The following instructions provide an example of how you can decode bidstream tokens using the EUID SDK for Python as a DSP.

1. Create a BidstreamClient:

client = BidstreamClient(EUID_BASE_URL, EUID_API_KEY, EUID_SECRET_KEY)

2. Refresh once at startup, and then periodically (recommended refresh interval is hourly):

client.refresh()

3. Decrypt a token into a raw EUID. Pass the token, and then do one of the following:

• If the bid request originated from a publisher's website, pass the domain name. The domain name must be all lower case, without spaces and without subdomain. For example, for Subdomain.DOMAIN.com, pass domain.com instead.

• Otherwise, pass null.

decrypted = client.decrypt_token_into_raw_uid(uid_token, domainOrAppName)
# If decryption succeeded, use the raw EUID.
if decrypted.success:
    #  Use decrypted.uid
else:
   # Check decrypted.status for the failure reason.

For a full example, see the sample_bidstream_client.py in examples/sample_bidstream_client.py.

FAQs

For a list of frequently asked questions for DSPs, see FAQs for DSPs.