diff --git a/src/requests/payment-request.ts b/src/requests/payment-request.ts
index 124fcd3a..b47b7eb7 100644
--- a/src/requests/payment-request.ts
+++ b/src/requests/payment-request.ts
@@ -87,7 +87,7 @@ export async function createPaymentRequest(
   const payNode = await getPayNode(client, session);
   const govPayMetadata = payNode.data?.govPayMetadata || [
     { key: "source", value: "PlanX" },
-    { key: "isInviteToPay", value: true },
+    { key: "paidViaInviteToPay", value: true },
     { key: "flow", value: session.flow.slug },
   ];
 
diff --git a/src/utils/govPayMetadata.test.ts b/src/utils/govPayMetadata.test.ts
index 007ad931..30e2c711 100644
--- a/src/utils/govPayMetadata.test.ts
+++ b/src/utils/govPayMetadata.test.ts
@@ -18,6 +18,10 @@ const mockMetadata: GovPayMetadata[] = [
     key: "key_someValueNotSetInPassport",
     value: "@someValueNotSetInPassportolean",
   },
+  {
+    key: "paidViaInviteToPay",
+    value: "@paidViaInviteToPay",
+  },
 ];
 
 const mockPassport: Passport = {
@@ -38,9 +42,15 @@ const mockPassport: Passport = {
   },
 };
 
+const mockParams: Parameters<typeof formatGovPayMetadata>[0] = {
+  metadata: mockMetadata,
+  userPassport: mockPassport,
+  paidViaInviteToPay: false,
+};
+
 describe("transforming the payload to the correct format for GovPay", () => {
   it("handles variables set in the Editor", () => {
-    const result = formatGovPayMetadata(mockMetadata, mockPassport);
+    const result = formatGovPayMetadata(mockParams);
     expect(result).toMatchObject({
       firstKey: "firstValue",
       secondKey: "secondValue",
@@ -48,7 +58,7 @@ describe("transforming the payload to the correct format for GovPay", () => {
   });
 
   it("handles variables set in the Passport", () => {
-    const result = formatGovPayMetadata(mockMetadata, mockPassport);
+    const result = formatGovPayMetadata(mockParams);
     expect(result).toMatchObject({
       key_string: "agent",
       key_boolean: true,
@@ -57,7 +67,7 @@ describe("transforming the payload to the correct format for GovPay", () => {
 });
 
 describe("validating data", () => {
-  const formatted = formatGovPayMetadata(mockMetadata, mockPassport);
+  const formatted = formatGovPayMetadata(mockParams);
 
   const get = (testKey: string) => [
     mockPassport.data[testKey], // Expected
@@ -120,4 +130,28 @@ describe("validating data", () => {
     // String ends in ellipsis (...)
     expect(result).toMatch(/.*\.\.\.$/);
   });
+
+  describe("handling of `paidViaInviteToPay` key", () => {
+    it("sets value to true based on input", () => {
+      const formatted = formatGovPayMetadata({
+        ...mockParams,
+        paidViaInviteToPay: true,
+      });
+
+      expect(formatted).toMatchObject({
+        paidViaInviteToPay: true,
+      });
+    });
+
+    it("sets value to false based on input", () => {
+      const formatted = formatGovPayMetadata({
+        ...mockParams,
+        paidViaInviteToPay: false,
+      });
+
+      expect(formatted).toMatchObject({
+        paidViaInviteToPay: false,
+      });
+    });
+  });
 });
diff --git a/src/utils/govPayMetadata.ts b/src/utils/govPayMetadata.ts
index 9a80e051..bc7713c9 100644
--- a/src/utils/govPayMetadata.ts
+++ b/src/utils/govPayMetadata.ts
@@ -9,6 +9,8 @@ import {
 
 type FormattedMetadata = NonNullable<GovUKCreatePaymentPayload["metadata"]>;
 
+const ITP_KEY = "paidViaInviteToPay" as const;
+
 const isPassportValue = (value: GovPayMetadataValue) =>
   typeof value === "string" && value.startsWith("@");
 
@@ -16,13 +18,21 @@ const isPassportValue = (value: GovPayMetadataValue) =>
  * Convert GovPayMetadata set in Editor to format accepted by GovPay API
  * Read dynamic data variables from passport and inject into output
  */
-const parseMetadata = (
-  metadata: GovPayMetadata[],
-  passport: Passport,
-): FormattedMetadata => {
+const parseMetadata = ({
+  metadata,
+  passport,
+  paidViaInviteToPay,
+}: {
+  metadata: GovPayMetadata[];
+  passport: Passport;
+  paidViaInviteToPay: boolean;
+}): FormattedMetadata => {
   let entries: [string, GovPayMetadataValue][] = [];
 
   entries = metadata.map(({ key, value }) => {
+    // ITP data is set at runtime by user journey, and not read from passport directly
+    if (key === ITP_KEY) return [ITP_KEY, paidViaInviteToPay];
+
     if (!isPassportValue(value)) return [key, value];
 
     // Remove "@" prefix
@@ -35,6 +45,7 @@ const parseMetadata = (
   });
 
   const parsedMetadata = Object.fromEntries(entries);
+
   return parsedMetadata;
 };
 
@@ -81,12 +92,21 @@ const validateMetadata = (
  *  - Static values (e.g. { vat_code: "abc123" })
  *  - Dynamic values (e.g. { property_type: "@project.propertyType" })
  */
-export const formatGovPayMetadata = (
-  metadata: GovPayMetadata[],
-  userPassport: IPassport,
-): FormattedMetadata => {
+export const formatGovPayMetadata = ({
+  metadata,
+  userPassport,
+  paidViaInviteToPay,
+}: {
+  metadata: GovPayMetadata[];
+  userPassport: IPassport;
+  paidViaInviteToPay: boolean;
+}): FormattedMetadata => {
   const passport = new Passport(userPassport);
-  const parsedAndValidated = parseMetadata(metadata, passport);
+  const parsedAndValidated = parseMetadata({
+    metadata,
+    passport,
+    paidViaInviteToPay,
+  });
 
   return parsedAndValidated;
 };