---
title: API Call Sequence Diagram
slug: connect/api-call-sequence-diagram
docTags: 
createdAt: 2023-12-27T06:14:08.982Z
---

API call sequence diagram:

![](https://api.archbee.com/api/optimize/3aXvvCPme0Nq_nC3YOUoN/BPfjCGzQApQeDhRT_Zq6P_image.png)

**Directory** refers to the directory service provided by the Brazilian central bank.

Brasil Open Finance ecosystem leverages a federation trust provider or directory of participants as the golden source of information on accredited participants and software that are authorized to partake in the Open Finance Brasil ecosystem.

The services by the Directory include

- Software registration and management.
- Software credential registration and management using ICP Certificates.
- Software Statement Assertion (SSA) generation

**ASPSP**: the Account Servicing Payment Service Provider, we can understand it as a banking institution.