diff --git a/package.json b/package.json
index eaa108d24..8fad5b14b 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "db:create": "npm run db:create:dev && npm run db:create:test",
     "db:create:dev": "node script/create-db.js --env development",
     "db:create:test": "node script/drop-db.js --env test && node script/create-db.js --env test",
-    "db:migrate:create": "knex migrate:make --name",
+    "db:migrate:create": "knex migrate:make",
     "db:migrate": "npm run db:migrate:dev && npm run db:migrate:test",
     "db:migrate:dev": "knex migrate:latest --verbose --env development",
     "db:migrate:test": "knex migrate:latest --verbose --env test",
diff --git a/server/db/migrations/20240528021821_add_letter_merge_vars.js b/server/db/migrations/20240528021821_add_letter_merge_vars.js
new file mode 100644
index 000000000..01c4ec6d4
--- /dev/null
+++ b/server/db/migrations/20240528021821_add_letter_merge_vars.js
@@ -0,0 +1,13 @@
+module.exports = {
+  async up(knex) {
+    await knex.schema.alterTable('letters', (table) => {
+      table.jsonb('merge_variables').nullable()
+    })
+  },
+
+  async down(knex) {
+    await knex.schema.alterTable('letters', (table) => {
+      table.dropColumn('merge_variables')
+    })
+  }
+}
diff --git a/src/components/DonateMoney.vue b/src/components/DonateMoney.vue
index 83f25d830..b901bab45 100644
--- a/src/components/DonateMoney.vue
+++ b/src/components/DonateMoney.vue
@@ -104,6 +104,7 @@ export default {
       const letterId = this.$store.state.letterId
       const letterVersion = this.$store.state.letterVersion
       const returnAddressId = this.$store.state.lobReturnAddressId
+      const mergeVariables = this.$store.state.mergeVariables
 
       return {
         letterTemplate: letterId,
@@ -114,7 +115,8 @@ export default {
         state: rep.address_state,
         city: rep.address_city,
         zip: rep.address_zip,
-        returnAddress: returnAddressId
+        returnAddress: returnAddressId,
+        mergeVariables
       }
     },
     styledCustomDonation() {
diff --git a/src/store/index.js b/src/store/index.js
index 21679573a..64c214e22 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -33,7 +33,8 @@ export default new Vuex.Store({
       state: '',
       zip: '',
       email: ''
-    }
+    },
+    mergeVariables: {}
   },
   mutations: {
     // TODO: Do we really need two setters here?