diff --git a/core/src/encodeURL.ts b/core/src/encodeURL.ts
index 2689d637..a12f0ed2 100644
--- a/core/src/encodeURL.ts
+++ b/core/src/encodeURL.ts
@@ -1,5 +1,5 @@
 import { SOLANA_PROTOCOL } from './constants.js';
-import type { Amount, Label, Memo, Message, Recipient, References, SPLToken } from './types.js';
+import type { Amount, Label, Memo, Message, Recipient, References, SPLToken, Redirect } from './types.js';
 
 /**
  * Fields of a Solana Pay transaction request URL.
@@ -31,6 +31,16 @@ export interface TransferRequestURLFields {
     message?: Message;
     /** `memo` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/SPEC.md#memo). */
     memo?: Memo;
+    /** `redirect` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/SPEC1.1.md#redirect). */
+    redirect?: Redirect;
+}
+
+/**
+ * Fields of a Solana Pay message sign request URL.
+ */
+export interface MessageSignRequestURLFields {
+    /** `link` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/message-signing-spec.md#link). */
+    link: URL;
 }
 
 /**
@@ -38,11 +48,17 @@ export interface TransferRequestURLFields {
  *
  * @param fields Fields to encode in the URL.
  */
-export function encodeURL(fields: TransactionRequestURLFields | TransferRequestURLFields): URL {
-    return 'link' in fields ? encodeTransactionRequestURL(fields) : encodeTransferRequestURL(fields);
+export function encodeURL(
+    fields: TransactionRequestURLFields | TransferRequestURLFields | MessageSignRequestURLFields
+): URL {
+    return 'link' in fields ? encodeTransactionOrMessageSignRequestURL(fields) : encodeTransferRequestURL(fields);
 }
 
-function encodeTransactionRequestURL({ link, label, message }: TransactionRequestURLFields): URL {
+function encodeTransactionOrMessageSignRequestURL({
+    link,
+    label,
+    message,
+}: TransactionRequestURLFields | (MessageSignRequestURLFields & { label: undefined; message: undefined })): URL {
     // Remove trailing slashes
     const pathname = link.search
         ? encodeURIComponent(String(link).replace(/\/\?/, '?'))
@@ -68,6 +84,7 @@ function encodeTransferRequestURL({
     label,
     message,
     memo,
+    redirect,
 }: TransferRequestURLFields): URL {
     const pathname = recipient.toBase58();
     const url = new URL(SOLANA_PROTOCOL + pathname);
@@ -102,5 +119,9 @@ function encodeTransferRequestURL({
         url.searchParams.append('memo', memo);
     }
 
+    if (redirect) {
+        url.searchParams.append('redirect', redirect.toString());
+    }
+
     return url;
 }
diff --git a/core/src/types.ts b/core/src/types.ts
index 4b3a7a8d..9d6eb636 100644
--- a/core/src/types.ts
+++ b/core/src/types.ts
@@ -25,5 +25,8 @@ export type Message = string;
 /** `memo` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/SPEC.md#memo). */
 export type Memo = string;
 
+/** `redirect` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/SPEC1.1.md#redirect). */
+export type Redirect = URL;
+
 /** `link` in the [Solana Pay spec](https://github.com/solana-labs/solana-pay/blob/master/SPEC.md#link). */
 export type Link = URL;