# Difficulty Integrating Custom Fields with CRM API **URL:** \ **Category:** APIs & Integrations\ **Tags:** free\ **Created:** [November 2, 2023, 12:40pm UTC](https://community.hubspot.com/t/difficulty-integrating-custom-fields-with-crm-api/93142 "2023-11-02T12:40:54Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Anarose](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@Anarose](https://community.hubspot.com/u/Anarose)\ **Post date:** [November 2, 2023, 12:40pm UTC](https://community.hubspot.com/t/difficulty-integrating-custom-fields-with-crm-api/93142/1 "2023-11-02T12:40:54Z")
I’m currently working on a project that involves integrating custom fields with our CRM system using the API. I’ve followed the documentation closely, but I’m encountering a roadblock. It is used to access the Wireless LAN adapter settings and perform various functions, including changing network name and password, configuring internal network security settings, setting up port forwarding, managing devices on the network connection, and updating firmware and software. [https://19216801.pro/](https://19216801.pro/) When I attempt to send a POST request to create a new contact with custom field data, I receive a “400 Bad Request” error. I’ve double-checked my request payload and headers, and everything seems correct. Has anyone else faced a similar issue or could provide any guidance on how to successfully integrate custom fields with the CRM API? Any ideas? ---
**Author:** ![Jaycee\_Lewis](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/jaycee_lewis/32/61352_2.png) [@Jaycee\_Lewis](https://community.hubspot.com/u/Jaycee_Lewis)\ **Post date:** [November 3, 2023, 9:19pm UTC](https://community.hubspot.com/t/difficulty-integrating-custom-fields-with-crm-api/93142/2 "2023-11-03T21:19:53Z")
Hi, @Anarose 👋 Thanks for your question. Can you share an example request and response, please? Seeing how you’re formatting things is very helpful for our community. Thank you! — Jaycee