This is Example api call which return campaigns data in response, I need to get last30_days spend of a campaigns.
<s:Envelope xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header xmlns="https://bingads.microsoft.com/CampaignManagement/v13">
<Action mustUnderstand="1">GetCampaignsByAccountId</Action>
<AuthenticationToken i:nil="false">access token</AuthenticationToken>
<CustomerAccountId i:nil="false">acc_id</CustomerAccountId>
<CustomerId i:nil="false">cus_id</CustomerId>
<DeveloperToken i:nil="false">dev_token</DeveloperToken>
</s:Header>
<s:Body>
<GetCampaignsByAccountIdRequest xmlns="https://bingads.microsoft.com/CampaignManagement/v13">
<AccountId>acc_id</AccountId>
<CampaignType>Search</CampaignType>
</GetCampaignsByAccountIdRequest>
</s:Body>
</s:Envelope>