Support for v2 of integrations API/ support new request signing

[pradtke]

Detailed Description

According to the API documentation the php sdk does not support v2 of the integrations api

The Integrations v2 API does not use the same authentication and request signing detailed earlier in this document. Our Python, Go, Java, and Node.JS API clients have been updated with the new authentication and signing requirements and include support for the Integrations v2 API endpoints.

We would like to use v2 of the integrations API.

Use Case

We would like to use v2 of the integrations api to see the SAML applications/integrations

Workarounds

We have not found a workaround. The v1 integrations api does not seem to return SAML applications.

[AaronAtDuo]

Note to my future self: we need to implement the v5 signing algorithm to support this.