> For the complete documentation index, see [llms.txt](https://docs.developer.singpass.gov.sg/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.developer.singpass.gov.sg/docs/legacy-verify/technical-specifications/technical-requirements.md).

# Technical Requirements

## 1. Transaction Log

Digital services which have integrated with Verify should track and store user transactions for potential issue management.

The following are some of the suggested minimum fields for tracking:

* State/ Transaction No. from the Verify request body
* Fields requested from Verify
* Time Stamp

In the event of user feedback or contact, these transaction logs may be requested by us to reconcile and resolve issues raised by the user.

***

## 2. X.509 Public Key

To implement RS256 (RSA Signature with SHA-256) Digital Signature for Verify APIs in your apps, please use a X.509 Public Key Certificate with RSA key size of 2048 bits or larger from one of the following compatible Certificate Authority (CA):

* Comodo/Sectigo
* digiCert
* GeoTrust
* GlobalSign
* [Netrust](https://www.netrust.net/netrust-singpass-myinfo-certificates/)\*
* Thawte
* VeriSign

\*Certificate must be issued by Netrust. Entrust-issued certs are not accepted.

{% hint style="warning" %}
ECC and ECDSA Public Key Certificates are currently NOT supported.
{% endhint %}

***

## 3. TLS & Cipher Suites

{% hint style="info" %}
**IMPORTANT:** In line with contemporary industry best practices, Verify supports TLS 1.2 and above.
{% endhint %}

The list of supported strong cipher suites include:

* TLS\_ECDHE\_ECDSA\_WITH\_AES\_256\_GCM\_SHA384
* TLS\_ECDHE\_ECDSA\_WITH\_AES\_128\_GCM\_SHA256
* TLS\_ECDHE\_RSA\_WITH\_AES\_256\_GCM\_SHA384
* TLS\_ECDHE\_RSA\_WITH\_AES\_128\_GCM\_SHA256

***

## 4. Webhook URLs (applicable to version 1 only)

For security reasons:

* Different Webhook URLs should be used for staging and production environments
* Fully Qualified Domain Name (FQDN) of staging and production environments should be used (i.e. instead of IP address)
* Webhook URLs should not contain Hash (#) or Wildcard (\*) characters


---

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