diff --git a/src/types/onramp.ts b/src/types/onramp.ts
index 59f5308..f534ba8 100644
--- a/src/types/onramp.ts
+++ b/src/types/onramp.ts
@@ -60,6 +60,13 @@ type BaseOnRampAppParams = {
    * `{ "0x1": ["base"] }`
    */
   addresses?: Record<string, string[]>;
+  /**
+   * The session token used to initialize the Coinbase Onramp experience.
+   * This token expires after a short period of time and can only be used once.
+   * A new token must be obtained for every new session.
+   * @see https://docs.cdp.coinbase.com/onramp/docs/api-initializing#getting-an-onramp-session-token
+   */
+  sessionToken?: string;
   /**
    * This optional parameter will restrict the assets available for the user to buy/send. It acts as a filter on the
    * networks specified in the {addresses} param.
diff --git a/src/types/widget.ts b/src/types/widget.ts
index cd09640..d025128 100644
--- a/src/types/widget.ts
+++ b/src/types/widget.ts
@@ -20,19 +20,10 @@ export type EmbeddedContentStyles = {
   top?: string;
 };
 
-export type CBPayExperienceWithAppId<T> = {
-  appId: string;
-  sessionToken?: never;
-} & CBPayExperienceBaseOptions<T>;
-
-export type CBPayExperienceWithSessionToken<T> = {
-  sessionToken: string;
-  appId?: never;
-} & CBPayExperienceBaseOptions<T>;
-
-type CBPayExperienceBaseOptions<T> = {
+export type CBPayExperienceOptions<T> = {
   widgetParameters: T;
   target?: string;
+  appId: string;
   host?: string;
   debug?: boolean;
   theme?: Theme;
@@ -46,7 +37,3 @@ type CBPayExperienceBaseOptions<T> = {
   experienceLoggedIn?: Experience;
   experienceLoggedOut?: Experience;
 };
-
-export type CBPayExperienceOptions<T> =
-  | CBPayExperienceWithAppId<T>
-  | CBPayExperienceWithSessionToken<T>;
diff --git a/src/utils/CoinbasePixel.test.ts b/src/utils/CoinbasePixel.test.ts
index bbd970e..9182c26 100644
--- a/src/utils/CoinbasePixel.test.ts
+++ b/src/utils/CoinbasePixel.test.ts
@@ -51,9 +51,14 @@ describe('CoinbasePixel', () => {
   });
 
   it('should initialize with sessionToken', () => {
-    const instance = createUntypedPixel({ sessionToken: 'test', appParams: defaultAppParams });
+    const sessionToken = 'test-session-token';
+    const instance = createUntypedPixel({
+      appId: 'test',
+      appParams: { ...defaultAppParams, sessionToken },
+    });
 
-    expect(instance.sessionToken).toEqual('test');
+    expect(instance.appId).toEqual('test');
+    expect(instance.appParams.sessionToken).toEqual(sessionToken);
   });
 
   it('should handle opening the embedded experience when logged out', () => {
diff --git a/src/utils/CoinbasePixel.ts b/src/utils/CoinbasePixel.ts
index 7cf4d2d..6b96e3e 100644
--- a/src/utils/CoinbasePixel.ts
+++ b/src/utils/CoinbasePixel.ts
@@ -26,8 +26,7 @@ export type ExperienceListeners = {
 
 export type CoinbasePixelConstructorParams = {
   host?: string;
-  appId?: string;
-  sessionToken?: string;
+  appId: string;
   appParams: JsonObject;
   debug?: boolean;
   theme?: Theme;
@@ -43,8 +42,7 @@ export type OpenExperienceOptions = {
 export class CoinbasePixel {
   private debug: boolean;
   private host: string;
-  private appId: string | undefined;
-  private sessionToken: string | undefined;
+  private appId: string;
   private eventStreamListeners: Partial<Record<EventMetadata['eventName'], (() => void)[]>> = {};
   private unsubs: (() => void)[] = [];
   private appParams: JsonObject;
@@ -54,14 +52,12 @@ export class CoinbasePixel {
   constructor({
     host = DEFAULT_HOST,
     appId,
-    sessionToken,
     appParams,
     debug,
     theme,
   }: CoinbasePixelConstructorParams) {
     this.host = host;
     this.appId = appId;
-    this.sessionToken = sessionToken;
     this.appParams = appParams;
     this.debug = debug || false;
     this.theme = theme;
@@ -79,7 +75,6 @@ export class CoinbasePixel {
 
     const url = generateOnRampURL({
       appId: this.appId,
-      sessionToken: this.sessionToken,
       host: this.host,
       theme: this.theme ?? undefined,
       ...this.appParams,
@@ -176,10 +171,6 @@ export class CoinbasePixel {
   };
 
   private startDirectSignin = (callback: () => void) => {
-    if (!this.appId) {
-      throw new Error('appId is required for direct signin');
-    }
-
     const queryParams = new URLSearchParams();
     queryParams.set('appId', this.appId);
     queryParams.set('type', 'direct');