diff --git a/services/web/scripts/add_salesforce_data_to_subscriptions.js b/services/web/scripts/add_salesforce_data_to_subscriptions.js
new file mode 100755
index 0000000000..dd811c39a0
--- /dev/null
+++ b/services/web/scripts/add_salesforce_data_to_subscriptions.js
@@ -0,0 +1,205 @@
+const fs = require('node:fs')
+const minimist = require('minimist')
+const { parse } = require('csv')
+const Stream = require('stream/promises')
+const { ObjectId, waitForDb } = require('../app/src/infrastructure/mongodb')
+const { Subscription } = require('../app/src/models/Subscription')
+
+function usage() {
+  console.log(
+    'Usage: node add_salesforce_data_to_subscriptions.js -f <filename> [options]'
+  )
+  console.log(
+    'Updates the subscriptions collection with external IDs for determining the Salesforce account that goes with the subscription. The file should be a CSV and have columns account_id, v1_id and subscription_id. The account_id column is the Salesforce account ID, the v1_id column is the V1 account ID, and the subscription_id column is the subscription ID.'
+  )
+  console.log('Options:')
+  console.log(
+    '  --commit, -c                     Commit changes to the database'
+  )
+  console.log(
+    '  --emptyFieldValue <value>      The value to treat as an empty field (default: NA)'
+  )
+  console.log(
+    '  -f, --filename <filename>      The path to the file to read data from'
+  )
+  console.log('  -h, --help                     Show this help message')
+  console.log('  -v, --verbose                  Produces more detailed logs')
+  process.exit(0)
+}
+
+const { commit, emptyFieldValue, filename, help, verbose } = minimist(
+  process.argv.slice(2),
+  {
+    string: ['emptyFieldValue', 'filename'],
+    boolean: ['commit', 'help', 'verbose'],
+    alias: {
+      commit: 'c',
+      filename: 'f',
+      help: 'h',
+      verbose: 'v',
+    },
+    default: {
+      commit: false,
+      emptyFieldValue: 'NA',
+      help: false,
+      verbose: false,
+    },
+  }
+)
+
+const SUBSCRIPTION_ID_FIELD = 'subscription_id'
+const SALESFORCE_ID_FIELD = 'account_id'
+const V1_ID_FIELD = 'v1_id'
+
+if (help) {
+  usage()
+  process.exit(0)
+}
+
+if (!filename) {
+  console.error('No filename provided')
+  usage()
+  process.exit(1)
+}
+
+const stats = {
+  totalRows: 0,
+  subscriptionIDMissing: 0,
+  usedV1ID: 0,
+  usedSalesforceID: 0,
+  processedRows: 0,
+  db: {
+    errors: 0,
+    matched: 0,
+    updateAttempted: 0,
+    updated: 0,
+  },
+}
+
+function showStats() {
+  console.log('Stats:')
+  console.log(`  Total rows: ${stats.totalRows}`)
+  console.log(`  Processed rows: ${stats.processedRows}`)
+  console.log(`  Skipped (no subscription ID): ${stats.subscriptionIDMissing}`)
+  console.log(`  Used V1 ID: ${stats.usedV1ID}`)
+  console.log(`  Used Salesforce ID: ${stats.usedSalesforceID}`)
+  if (commit) {
+    console.log('Database operations:')
+    console.log(`  Errors: ${stats.db.errors}`)
+    console.log(`  Matched: ${stats.db.matched}`)
+    console.log(`  Updated: ${stats.db.updated}`)
+    console.log(`  Update attempted: ${stats.db.updateAttempted}`)
+  }
+}
+
+function pickRelevantColumns(row) {
+  const newRow = {
+    salesforceId: row[SALESFORCE_ID_FIELD],
+  }
+
+  if (row[V1_ID_FIELD] && row[V1_ID_FIELD] !== emptyFieldValue) {
+    newRow.v1Id = row[V1_ID_FIELD]
+  }
+
+  if (
+    row[SUBSCRIPTION_ID_FIELD] &&
+    row[SUBSCRIPTION_ID_FIELD] !== emptyFieldValue
+  ) {
+    newRow.subscriptionId = row[SUBSCRIPTION_ID_FIELD]
+  }
+
+  return newRow
+}
+
+async function processRows(rows) {
+  for await (const row of rows) {
+    const { v1Id, salesforceId, subscriptionId } = row
+
+    const update = {}
+    if (v1Id) {
+      stats.usedV1ID++
+      update.v1_id = v1Id
+    } else {
+      stats.usedSalesforceID++
+      update.salesforce_id = salesforceId
+    }
+
+    // Useful for logging later.
+    const updateString = Object.entries(update).flatMap(([k, v]) => `${k}=${v}`)
+
+    if (commit) {
+      try {
+        const result = await Subscription.updateOne(
+          { _id: new ObjectId(subscriptionId) },
+          update,
+          { upsert: false }
+        )
+        result.matchedCount && stats.db.matched++
+        if (result.modifiedCount) {
+          stats.db.updated++
+          if (verbose) {
+            console.log(
+              `Updated subscription ${subscriptionId} to set ${updateString}`
+            )
+          }
+        }
+      } catch (error) {
+        stats.db.errors++
+        if (verbose) {
+          console.error(
+            `Error updating subscription ${subscriptionId}: ${error}`
+          )
+        }
+      } finally {
+        stats.db.updateAttempted++
+      }
+    } else if (verbose) {
+      console.log(`Would set ${updateString} on subscription ${subscriptionId}`)
+    }
+  }
+}
+
+async function main() {
+  await waitForDb()
+
+  await Stream.pipeline(
+    fs.createReadStream(filename),
+    parse({
+      columns: true,
+      cast: function (value, context) {
+        if (context.column === V1_ID_FIELD && value !== emptyFieldValue) {
+          return parseInt(value)
+        }
+        return value
+      },
+      on_record: function (record, context) {
+        stats.totalRows++
+        const row = pickRelevantColumns(record)
+        // Cannot process records without a Subscription ID
+        if (!row.subscriptionId) {
+          if (verbose) {
+            console.log(
+              `No subscription id found for ${row.salesforceId}, skipping...`
+            )
+          }
+          stats.subscriptionIDMissing++
+          return null
+        }
+        stats.processedRows++
+        return row
+      },
+    }),
+    processRows
+  )
+}
+
+if (!commit) {
+  console.log('Dry run')
+} else {
+  console.log('Committing changes to the database')
+}
+
+main().then(() => {
+  showStats()
+  process.exit()
+})