Integration API

Overview

The integration-api is the provider execution layer. It sits between assistant-api and every external AI provider — OpenAI, Anthropic, Deepgram, ElevenLabs, and others. It stores all provider credentials encrypted at rest and is the only service in the platform that ever holds or transmits plaintext API keys.

Port

9004 — HTTP · gRPC (cmux)

Language

Go 1.25 Gin (REST) + gRPC

Storage

PostgreSQL integration_db Redis (provider cache)

The integration-api is the only service that decrypts and uses provider API keys. Keys are decrypted in-memory per request and never written to logs, forwarded to other services, or stored in plaintext anywhere on disk.

Components

Caller Layer — Provider API implementations

Each external provider is implemented as a Go package under api/integration-api/internal/caller/<provider>/. Every package follows a consistent structure:

File	Purpose
`<provider>.go`	Client initialization, credential binding
`llm.go`	LLM caller — streaming token inference
`embedding.go`	Embedding model invocation (where supported)
`verify-credential.go`	Pre-storage credential validation

The caller/callers.go factory registers all providers and routes execution to the correct implementation based on the credential type stored in integration_db.Adding a new LLM providerCreate api/integration-api/internal/caller/<provider>/ with the above files, then register in callers.go. No changes to other services are needed.

Credential Encryption

Credentials follow a strict encrypt-on-write, decrypt-on-use lifecycle:

OAuth 2.0 Integration

For providers that use OAuth (e.g., Google, GitHub), integration-api manages the full OAuth flow: redirect, callback, token storage, and automatic refresh.

OAuth Setting	Variable
Callback URL	`OAUTH_CALLBACK_URL`
Google client	`GOOGLE_OAUTH_CLIENT_ID`, `GOOGLE_OAUTH_CLIENT_SECRET`
GitHub client	`GITHUB_OAUTH_CLIENT_ID`, `GITHUB_OAUTH_CLIENT_SECRET`

Supported Providers

LLM
STT
TTS
Telephony

Provider	Notes
OpenAI	GPT-4o, GPT-4, GPT-3.5 · Function calling · Streaming
Anthropic	Claude 3.5 Sonnet, Claude 3 · Tool use · Streaming
Google Gemini	Gemini Pro · Flash · Streaming
Google Vertex AI	Enterprise Gemini deployment
Azure OpenAI	Enterprise GPT deployment with custom endpoint
AWS Bedrock	Llama, Titan, Mistral via AWS
Cohere	Command R+ · Streaming
Mistral	Mistral Large · Small · Streaming
HuggingFace	Inference API
Replicate	Model hosting via Replicate API
VoyageAI	Embeddings and reranking

Provider	Notes
Google Cloud STT	Streaming recognition, 100+ languages
Azure Cognitive Services	Microsoft Neural Speech, real-time
Deepgram	Low-latency streaming, Nova-2 and Nova-3 models
AssemblyAI	Streaming and batch transcription
Cartesia	Real-time with speaker diarization
Sarvam AI	Indian language support

Provider	Notes
Google Cloud TTS	WaveNet / Neural2 voices
Azure Cognitive Services	Neural voices, 140+ languages
ElevenLabs	High-fidelity voice cloning, low latency
Deepgram Aura	Fast synthesis, multiple voices
Cartesia	Streaming synthesis
Sarvam AI	Indian language support

Provider	Notes
Twilio	Programmable Voice, Media Streams, bulk calling
Vonage	Voice API, WebSocket audio streaming
Exotel	Cloud telephony for India / SEA markets

Configuration

Edit docker/integration-api/.integration.env before starting the service.

Required variables

Variable	Required	Default	Description
`SECRET`	✅ Yes	`rpd_pks`	JWT signing secret — must match all services
`POSTGRES__HOST`	✅ Yes	`postgres`	PostgreSQL host
`POSTGRES__DB_NAME`	✅ Yes	`integration_db`	Database name
`POSTGRES__AUTH__USER`	✅ Yes	`rapida_user`	Database user
`POSTGRES__AUTH__PASSWORD`	✅ Yes	—	Database password
`REDIS__HOST`	✅ Yes	`redis`	Redis host
`INTEGRATION_CRYPTO_KEY`	✅ Yes	—	AES-256-GCM key for credential encryption
`WEB_HOST`	✅ Yes	`web-api:9001`	web-api gRPC address

Optional OAuth variables

Variable	Required	Description
`OAUTH_CALLBACK_URL`	No	OAuth redirect URI
`GOOGLE_OAUTH_CLIENT_ID`	No	Google OAuth app client ID
`GOOGLE_OAUTH_CLIENT_SECRET`	No	Google OAuth app client secret
`GITHUB_OAUTH_CLIENT_ID`	No	GitHub OAuth app client ID
`GITHUB_OAUTH_CLIENT_SECRET`	No	GitHub OAuth app client secret

Full environment file

# ── Service identity ──────────────────────────────────────────────
SERVICE_NAME=integration-api
HOST=0.0.0.0
PORT=9004
LOG_LEVEL=debug
SECRET=rpd_pks
ENV=development

# ── PostgreSQL ────────────────────────────────────────────────────
POSTGRES__HOST=postgres
POSTGRES__PORT=5432
POSTGRES__DB_NAME=integration_db
POSTGRES__AUTH__USER=rapida_user
POSTGRES__AUTH__PASSWORD=rapida_db_password
POSTGRES__MAX_OPEN_CONNECTION=10
POSTGRES__SSL_MODE=disable

# ── Redis ─────────────────────────────────────────────────────────
REDIS__HOST=redis
REDIS__PORT=6379

# ── Credential encryption ─────────────────────────────────────────
# Required: AES-256-GCM key for encrypting stored provider credentials
# Generate: openssl rand -hex 32
INTEGRATION_CRYPTO_KEY=your_32_char_encryption_key_here

# ── Internal service addresses ────────────────────────────────────
WEB_HOST=web-api:9001

INTEGRATION_CRYPTO_KEY protects all stored provider credentials. Store it in a secret manager (AWS Secrets Manager, HashiCorp Vault, Kubernetes Secrets) — never commit it to version control. If this key is rotated or lost, all stored credentials must be re-entered, as the ciphertext becomes unreadable.

Running

Docker Compose
From Source

# Start integration-api and its dependencies
make up-integration

# Follow logs
make logs-integration

# Rebuild after code changes
make rebuild-integration

Requires Go 1.25, PostgreSQL 15, and Redis 7 running locally.

# Load base env file
export $(grep -v '^#' docker/integration-api/.integration.env | xargs)

# Override Docker hostnames
export POSTGRES__HOST=localhost
export REDIS__HOST=localhost
export WEB_HOST=localhost:9001

# Run
go run cmd/integration/integration.go

Health & Observability

Endpoint	Purpose
`GET /readiness/`	Reports whether the service is ready (DB + Redis connected)
`GET /healthz/`	Liveness probe

curl http://localhost:9004/readiness/

Troubleshooting

Credential test fails for a provider

Verify the API key has the correct permissions for your account tier.
Check the provider’s status page for outages.
Confirm INTEGRATION_CRYPTO_KEY has not changed since the credential was stored.

LLM streaming times out

Check make logs-integration for provider-side timeout errors.
Increase POSTGRES__MAX_OPEN_CONNECTION if database contention is visible.
For Azure OpenAI: confirm the deployment name in the credential matches the actual Azure deployment.

Stored credentials unreadable after restart

INTEGRATION_CRYPTO_KEY has changed between restarts. Credentials encrypted with the old key cannot be decrypted. Set the key back to its original value, or re-enter all provider credentials through the dashboard.

Next Steps

Assistant API

How integration-api is called during a live voice conversation.

Endpoint API

Webhook delivery after call events.

Configuration Reference

Full environment variable reference.

Architecture

Full system topology.

Getting Started

Dashboard (UI)

Web API

Assistant API

Endpoint API

Document API

Integration API

Overview

Port

Language

Storage

Components

Supported Providers

Configuration

Required variables

Optional OAuth variables

Full environment file

Running

Health & Observability

Troubleshooting

Next Steps

Assistant API

Endpoint API

Configuration Reference

Architecture

Getting Started

Dashboard (UI)

Web API

Assistant API

Integration API

Endpoint API

Document API

​Overview

Port

Language

Storage

​Components

​Supported Providers

​Configuration

​Required variables

​Optional OAuth variables

​Full environment file

​Running

​Health & Observability

​Troubleshooting

​Next Steps

Assistant API

Endpoint API

Configuration Reference

Architecture

Overview

Components

Supported Providers

Configuration

Required variables

Optional OAuth variables

Full environment file

Running

Health & Observability

Troubleshooting

Next Steps