def register_subscriber(imsi:nil, registration_secret:nil, groupId:nil, tags:{})
      params = { registrationSecret: registration_secret, tags: tags }
      params[groupId] = groupId if groupId
      @api.post(path: "/subscribers/#{imsi}", payload: params)
    end
def register_subscriber(imsi:nil, registration_secret:nil, groupId:nil, tags:{})
      params = { registrationSecret: registration_secret, tags: tags }
      params[groupId] = groupId if groupId
      @api.post(path: "/subscribers/#{imsi}", payload: params)
    end
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