Absolutely! You can tweak your Google Analytics Reporting API request to get the aggregated session count for both google / cpc and facebook / cpc combined. Here are a couple of simple, effective approaches:

Approach 1: Get Only the Aggregated Total #

If you just need the combined session count (and don't need to see individual breakdowns for each source/medium), remove the ga:sourceMedium dimension and adjust your filter logic to match either value:

{
  "reportRequests": [
    {
      "viewId": "XXXXXX",
      "dateRanges": [
        {
          "startDate": "2021-07-01",
          "endDate": "2021-07-31"
        },
        {
          "startDate": "2020-07-01",
          "endDate": "2020-07-31"
        }
      ],
      "metrics": [
        {
          "expression": "ga:sessions"
        }
      ],
      "dimensionFilterClauses": [
        {
          "operator": "OR", // Ensures either filter match is included
          "filters": [
            {
              "dimensionName": "ga:sourceMedium",
              "operator": "EXACT",
              "expressions": ["google / cpc"]
            },
            {
              "dimensionName": "ga:sourceMedium",
              "operator": "EXACT",
              "expressions": ["facebook / cpc"]
            }
          ]
        }
      ]
    }
  ]
}

Key Changes: #

• Removed the ga:sourceMedium dimension: Without this dimension, the API returns a single aggregated value for all matching rows.
• Added "operator": "OR" to the filter clause: This fixes your original request's implicit AND logic (which would return no results, since a row can't belong to two source/mediums at once).

You can simplify the filter even further using the IN operator instead of two separate filters:

"dimensionFilterClauses": [
  {
    "filters": [
      {
        "dimensionName": "ga:sourceMedium",
        "operator": "IN",
        "expressions": ["google / cpc", "facebook / cpc"]
      }
    ]
  }
]

Approach 2: Get Individual Breakdowns + Aggregated Total #

If you want to see both the individual session counts for each source/medium and their combined total, keep the ga:sourceMedium dimension and enable row totals:

{
  "reportRequests": [
    {
      "viewId": "XXXXXX",
      "dateRanges": [
        {
          "startDate": "2021-07-01",
          "endDate": "2021-07-31"
        },
        {
          "startDate": "2020-07-01",
          "endDate": "2020-07-31"
        }
      ],
      "metrics": [
        {
          "expression": "ga:sessions"
        }
      ],
      "dimensions": [
        {
          "name": "ga:sourceMedium"
        }
      ],
      "dimensionFilterClauses": [
        {
          "operator": "OR",
          "filters": [
            {
              "dimensionName": "ga:sourceMedium",
              "operator": "EXACT",
              "expressions": ["google / cpc"]
            },
            {
              "dimensionName": "ga:sourceMedium",
              "operator": "EXACT",
              "expressions": ["facebook / cpc"]
            }
          ]
        }
      ],
      "showRowTotals": true // Adds a total row with combined session counts
    }
  ]
}

What This Does: #

• Returns two rows with individual session counts for google / cpc and facebook / cpc
• Adds an additional "Total" row at the end with the aggregated sum of both values for each date range

内容的提问来源于stack exchange，提问作者Anders