backend/shopping-cart-service/add_to_cart.py [44:53]:
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    cart_id, _ = get_cart_id(event["headers"])

    # Because this method can be called anonymously, we need to check there's a logged in user
    user_sub = None
    jwt_token = event["headers"].get("Authorization")
    if jwt_token:
        user_sub = get_user_sub(jwt_token)

    try:
        product = get_product_from_external_service(product_id)
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backend/shopping-cart-service/update_cart.py [47:56]:
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    cart_id, _ = get_cart_id(event["headers"])

    # Because this method can be called anonymously, we need to check if there's a logged in user
    user_sub = None
    jwt_token = event["headers"].get("Authorization")
    if jwt_token:
        user_sub = get_user_sub(jwt_token)

    try:
        product = get_product_from_external_service(product_id)
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