Knowledge Base Fact Grounding
Grounds generated responses strictly in your company knowledge base facts, documentation, and refund policies.
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Context-aware email reply generation API grounded in business knowledge bases, custom rules, and tone controls.
https://test.rsflowhub.com/api/v1/ai/email-reply
Automated Professional Email Reply Generator API is a ready-to-use REST API on RSFlowHub for developers building web, mobile and AI agent applications. Send a JSON request to POST /api/v1/ai/email-reply with your API key; RSFlowHub runs it on a tuned AI model (with automatic fallback to a backup provider) and returns a structured JSON result, usually within 1 to 3 seconds.
X-API-Key Header
curl -X POST "https://test.rsflowhub.com/api/v1/ai/email-reply" \
-H "Content-Type: application/json" \
-H "X-API-Key: rfh_your_api_key" \
-d '{"email_text":"Hi, I was charged $49 but I cancelled my account yesterday. Please refund me immediately.","sender_name":"John Doe","recipient_name":"Support Team","knowledge_base":["Refunds are only issued if requested within 14 days of the charge.","Standard response time is 24 hours."],"rules":["Never promise a refund if you are unsure.","Be empathetic but firm.","If the user threatens a chargeback, escalate to a human."],"tone":"professional"}'
<?php
$client = new \GuzzleHttp\Client();
$response = $client->post('https://test.rsflowhub.com/api/v1/ai/email-reply', [
'headers' => [
'Content-Type' => 'application/json',
'X-API-Key' => 'rfh_your_api_key',
],
'json' => array (
'email_text' => 'Hi, I was charged $49 but I cancelled my account yesterday. Please refund me immediately.',
'sender_name' => 'John Doe',
'recipient_name' => 'Support Team',
'knowledge_base' =>
array (
0 => 'Refunds are only issued if requested within 14 days of the charge.',
1 => 'Standard response time is 24 hours.',
),
'rules' =>
array (
0 => 'Never promise a refund if you are unsure.',
1 => 'Be empathetic but firm.',
2 => 'If the user threatens a chargeback, escalate to a human.',
),
'tone' => 'professional',
),
]);
echo $response->getBody();
const response = await fetch('https://test.rsflowhub.com/api/v1/ai/email-reply', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'X-API-Key': 'rfh_your_api_key'
},
body: JSON.stringify({"email_text":"Hi, I was charged $49 but I cancelled my account yesterday. Please refund me immediately.","sender_name":"John Doe","recipient_name":"Support Team","knowledge_base":["Refunds are only issued if requested within 14 days of the charge.","Standard response time is 24 hours."],"rules":["Never promise a refund if you are unsure.","Be empathetic but firm.","If the user threatens a chargeback, escalate to a human."],"tone":"professional"})
});
const data = await response.json();
console.log(data);
import requests
url = "https://test.rsflowhub.com/api/v1/ai/email-reply"
headers = {
"Content-Type": "application/json",
"X-API-Key": "rfh_your_api_key"
}
payload = {"email_text":"Hi, I was charged $49 but I cancelled my account yesterday. Please refund me immediately.","sender_name":"John Doe","recipient_name":"Support Team","knowledge_base":["Refunds are only issued if requested within 14 days of the charge.","Standard response time is 24 hours."],"rules":["Never promise a refund if you are unsure.","Be empathetic but firm.","If the user threatens a chargeback, escalate to a human."],"tone":"professional"}
response = requests.post(url, json=payload, headers=headers)
print(response.json())
Grounds generated responses strictly in your company knowledge base facts, documentation, and refund policies.
Enforces strict operational guardrails e.g. "Never promise a refund if unsure" or "Escalate chargeback threats".
Select between professional, empathetic, firm, concise, or friendly communication tones.
Formats professional email greetings, recipient names, sender titles, and signature blocks automatically.
See how developers integrate this API endpoint into production apps.
Generate instant professional draft replies for support agents answering billing and account inquiries.
Generate context-aware out-of-office replies providing targeted contact links depending on sender query.
Automatically respond to buyer refund inquiries following exact store 14-day policy rules.
Comparing RSFlowHub's specialized API gateway vs raw multi-turn LLM prompts vs legacy regex rules.
| Evaluation Metric | RSFlowHub API | Raw LLM Prompts | Legacy Regex / Rules |
|---|---|---|---|
| Response Structure | Validated JSON envelope | Unstructured markdown or chat format | Brittle custom regex tuples |
| Setup Effort | One POST request, no prompts | Write and maintain prompts + output parsing | Fast, but rule lists miss context and sarcasm |
| Pricing Model | Flat 2 credit/request | Volatile token-based billing | High server maintenance overhead |
| Multi-Turn Hallucination | Zero (Deterministic validators) | Output format can drift between model versions | No semantic AI intelligence |
| Developer Integration | 3 lines cURL, PHP, JS, Python | Complex prompt engineering & retry loop | Fragile manual rule maintenance |
email_text
string
Original incoming email body or customer ticket text to generate a reply for.
knowledge_base
array
Optional array of company facts, policy points, or documentation rules to ground the reply.
rules
array
Optional strict operational guardrails (e.g. ["Be empathetic but firm", "If user threatens chargeback, escalate"]).
tone
string
Desired writing tone ("professional", "empathetic", "friendly", "concise"). Default: "professional".
sender_name
string
Name of the agent, bot, or department sending the email reply.
recipient_name
string
Customer or recipient name.
context
string
Customer account notes or previous ticket interaction summary.
Every endpoint returns the same envelope: success, request_id, data.result and meta.
{
"success": true,
"request_id": "req_3f9a2c7e-5b1d-4e8a-9c2f-7d6e1a0b4c8d",
"data": {
"result": {
"reply_text": "Hi there, thanks for flagging this. I can see the duplicate charge on your March invoice and have started a refund for the second payment. You should see it within 5-7 business days.",
"confidence_score": 0.91,
"requires_human_escalation": false,
"escalation_reason": null,
"triggered_actions": []
}
},
"meta": {
"version": "v1",
"timestamp": "2026-10-05T09:30:00Z"
}
}
Everything you need to know about integrating and using Automated Professional Email Reply Generator API.
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