As a Paychex partner, follow the steps below to integrate your application with a client.

• Use the RequestClientAccess endpoint to push your app to the client's Paychex Flex account under Integrated Apps.
• Provide the Client's 8-digit displayId to initiate the access request
• when the request succeeds, you will receive a deep link URL, which you can share with the client to complete the set up

Use the cURL example below to submit the client access request.

curl --location 'https://api.paychex.com/management/requestclientaccess' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer <Your_bearerToken_here>' \
--data '{
    "displayId":<display_Id>
}'

Sample Response  

{
    "approvalLink": "https://myapps.paychex.com/#?clients=clientId&app=IntegratedApplicationsAppV2&appContext=%7B%22clientId%22:%22008WQ28JLRREFLLE7HRR%22,%22appId%22:%2200H2A1IUK6FRAUE2T6P4%22%7D"
}

Client Setup in Paychex Flex

Your client must complete the following steps in Paychex Flex to approve your Partner App and finish the integration setup:
1. Log in to Paychex Flex as a Flex Admin user.
2. Navigate to Company Settings → Integrated Applications.
3. Locate your Partner App. It will appear with an “Access Requested” status.
4. Open the app and approve the connection.
5. Review and agree to the Third-Party Terms of Use, then click Save to confirm the integration.

If your client needs help linking their account, they can contact Paychex Support using:
https://developer.paychex.com/support