Hiring n8n & WhatsApp Automation Developer (Chat Mitra + Razorpay) – Fixed Project

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1

Headline: Hiring n8n & WhatsApp Automation Developer (Chat Mitra + Razorpay)

– Fixed Project

About the Project

I am looking for an experienced automation expert to build an end-to-end

WhatsApp file delivery system. I need you to build a dynamic conversational flow

connected to Chat Mitra, use an n8n backend (installed and configured on my plain

Hostinger KVM2 VPS) to generate menus directly from a database, process

payments via Razorpay, and automate digital file delivery via email.

Tech Stack You Will Work With (Strictly Limited To):

 WhatsApp API: Chat Mitra

 Automation: n8n (To be installed via Docker on a plain Hostinger Ubuntu

VPS)

 Payments: Razorpay

 Delivery: SMTP Email (via custom domain)

Scope of Work

1. Server & n8n Setup

 Install and configure Docker, n8n, and any necessary reverse proxy (e.g.,

Nginx/Traefik) on a fresh Hostinger Ubuntu 24.04 VPS.

 Configure secure local directories on the server for hosting the PDF files.

2. Email & SMTP Setup

 Create the official business email via my Hostinger account for our custom

domain.

 Configure all necessary DNS records (SPF, DKIM, DMARC) so the n8n

automated delivery emails do not land in spam.

3. 100% Dynamic Menus (n8n Driven) & Navigation

 The entire WhatsApp menu flow must be dynamically generated by n8n.

 Dual Source Database Architecture: n8n must be configured to read from

two separate master Excel/CSV databases: one dedicated exclusively to

Technical courses and one dedicated exclusively to Non-Technical courses.

 When the user sends “Hi”, Chat Mitra must instantly webhook n8n to

generate the first menu.

 GLOBAL UI REQUIREMENT: Every single interactive message or menu

window generated by n8n must include a “Back” button, allowing the user to

seamlessly return to the previous step at any point in the flow.

 Initial Category Selection: The first menu must ask the user to select between

two main categories: 1. Technical or 2. Non-Technical.

 Branching Flow Sequences:

o If Technical (Reads from Database 1): The flow sequence is Course

Name → Semester → Product.

o If Non-Technical (Reads from Database 2): The flow sequence is State

→ Medium → Stream → Course Name → Semester → Product.

 As we add new rows to the databases, the WhatsApp menus must update

automatically without requiring manual edits to the Chat Mitra chatbot.

4. Support Routing

 Add a “Request Course / Help” option to the Main Menu and at the end of

the flow.

 If clicked, the bot must reply with a text message directing the user to email

support.

5. Course Display

 After the final product selection, n8n must push an Interactive List Message

back to WhatsApp displaying the available subjects/products.

 CRITICAL UI REQUIREMENT: The items within this Interactive List

Message must be populated using the Title column from the database (e.g.,

“Dummy Subject Title 1”).

 Do not use internal course codes for the list display.

6. Cart System

 When a subject/product is selected from the list, n8n must push a message

detailing the Title and price.

 Display only one interactive button: “Add to Cart”.

 (No syllabus preview is required) .

 Multi-Select Cart Logic: When a user clicks “Add to Cart”, n8n must

temporarily store this selection and reply with a cart summary message,

offering two buttons: “Add More Subjects” (which loops them back to the

Course Display list) or “Proceed to Checkout”.

7. Student Details & Anti-Abuse Logic

 Once the user clicks “Proceed to Checkout”, prompt the user to enter their Full

Name (with basic validation to reject special characters/numbers), followed

by their Email Address (with format validation).

 CRITICAL CHECK: At this point, n8n must check the user’s mobile number

against the master databases.

 If the user has already made more than 3 purchases from this specific mobile

number within the current Financial Year (FY), the system must instantly

block the transaction and notify the user to avoid illegitimate purchases.

 Finally, display a required Declaration message containing a hyperlink to our

Terms & Conditions along with an “I Agree” button.

 Upon agreement, send this complete checkout payload (containing all cart

items) to n8n via Webhook.

8. Payment Generation

 Receiving the final checkout payload, n8n must calculate the total cart value,

generate a specific Razorpay payment link for the combined amount, and

send it via WhatsApp.

9. Fulfillment, Invoicing & Analytics (Consolidated Email Logic)

 Catch the Razorpay payment.captured webhook.

 Trigger the SMTP email node to send a single fulfillment email to the

customer.

 Anti-Piracy PDF Stamping: Before sending, n8n must dynamically

stamp/watermark every PDF file from the cart with a timestamp and the

generated Invoice Number to strictly control piracy. This stamp must be

placed in the footer at the bottom-left corner in a small but legible font size.

 This email must contain BOTH the stamped PDF notes as file attachments

(pulled from the local VPS) AND the attached Razorpay Payment Receipt or

Invoice.

 Sales Record Database (Single Workbook): n8n must explicitly record every

successful sale back into our master sales ledger. This ledger will be one

single Google Sheets/Excel workbook containing two separate sheets (tabs) .

n8n must dynamically route and log the sale into either the “Technical” sheet

or the “Non-Technical” sheet based on the purchased items, logging the

mobile number, state-wise, and quarter-wise data.

 (Updated Requirement) n8n must track cumulative sales turnover. If the

total turnover is under ₹20 Lakhs, attach standard Razorpay receipts to the

fulfillment email. Once the turnover exceeds ₹20 Lakhs, the workflow must

dynamically switch to using the Razorpay Invoices API to generate and attach

GST-compliant invoices to that same email instead.

 Send a final automated message via Chat Mitra confirming successful

payment and email delivery.

Security & Access Provided

 You will be provided with “Skeleton Files” containing 100% fake, randomized

dummy data (including dummy PDFs and pricing) to build the database

logic.

 You are responsible for using your own test Chat Mitra sandbox/number

during development to avoid triggering messages to live users.

 You will not have access to our live proprietary curriculum.

 You will be provided with Razorpay TEST API keys only.

 You will get temporary SSH/root access to a plain Hostinger Ubuntu VPS to

configure the environment, Chat Mitra API tokens, and limited Hostinger

hPanel access (only for email/DNS setup).

To Apply: Please DM me with:

 Your fixed-price quote for this exact scope of work.

 Your estimated timeline for completion (in days).

4 Likes
2

Hello @EDTECH

This is well within my scope, I’ve built similar end-to-end WhatsApp automation systems on n8n before. Just sent you a DM with my details.

4

Hi @EDTECH ,

This is a serious, well-structured scope — and honestly, most people here won’t be able to execute it end-to-end without breaking something midway (especially the dynamic menu logic + anti-abuse + Razorpay + PDF stamping combo).

I can handle the full system. I’ve built complex n8n-based automation systems with WhatsApp APIs, payment integrations, dynamic database-driven flows, and AI-powered workflows — including CRM systems, onboarding pipelines, and multi-step automation with validation + state handling.

What stands out in your requirement (and what I’ll handle properly):

  • Fully dynamic WhatsApp flow (n8n-driven, not hardcoded chatbot logic)

  • Clean state management for cart + back navigation

  • Proper anti-abuse logic (purchase tracking + validation)

  • Reliable Razorpay webhook handling + invoice switching logic

  • Automated PDF stamping + secure delivery via SMTP

  • Structured sales logging + reporting (sheet routing logic)

I don’t just “connect nodes” — I design systems that don’t break when scaled or modified.

Here’s my full project portfolio (with demos):
:link: https://muhammad-ai-automations.notion.site/Muhammad-Bin-Zohaib-AI-Automation-Projects-29da292a241380f889c2e337a134c010

If you’re serious about getting this built properly (not patched together), let’s discuss. I can walk you through how I’d structure this before we start.

Best,
Muhammad Bin Zohaib
:open_mailbox_with_raised_flag: [email protected]

5

I have 3+ years of experience building advanced automation systems using n8n, including WhatsApp workflows, API integrations, payment automation, and dynamic data-driven systems. I’ve worked on building end-to-end flows involving webhooks, CRM/data handling, and automated delivery systems.

I’m also a top supporter of the n8n community and focus on building scalable, modular workflows with proper error handling and clean architecture.

I’m confident I can handle the full workflow including dynamic menu generation, cart logic, Razorpay integration, and automated email delivery with processing logic.

Check Inbox so we can discuss further, and schedule a short meeting.

6

Hi EDTECH, Welcome to the community!!

This is a well-structured scope and definitely achievable with the right architecture in n8n. I’ve worked on complex automation systems involving WhatsApp APIs, payment integrations, dynamic database-driven menus, and automated digital delivery pipelines.

The key part of this project will be designing a stable backend workflow that handles dynamic menu generation from your databases, cart/session management, Razorpay webhook processing, PDF stamping, and reliable fulfillment without breaking as the database grows.

I can handle the full implementation including VPS setup, Docker + n8n deployment, WhatsApp flow architecture, payment automation, PDF delivery, and structured sales logging.

I’ve sent you a DM so we can discuss the implementation approach and timeline.

7

Hi! Feel free to check out our profile – if it seems like a good fit, we’d be more that happy to connect and discuss how we can support your project. Easy8 AI Agency

8

Hey Profile - EDTECH - n8n Community

I got you, I have been building all forms of automations for the past 2 years and have built 100s of flows for my clients. Have worked with all sorts of companies and gotten them 10s of thousands in revenue or savings by strategic flows. When you decide to work with me, not only will I build this flow out, but also give you a free consultation like I have for all my clients that led to these revenue jumps.

I have built a similar workflow like this for one of my clients. I can not only share that but also how you can streamline processes in your company for faster operations. All this with no strings attached on our first call.

Here, have a look at my website and you can book a call with me there!

Talk soon!

9

Hey @EDTECH — I saw your post about automating WhatsApp + Razorpay + PDF delivery with n8n. This is exactly what I build.

Here’s how I’d architect it: Razorpay webhook → n8n → validate payment → query your database for the purchased course → generate stamped PDF → send via Chat Mitra WhatsApp API. Cart and session state managed through a database node between steps.

I’ve built similar payment-triggered document delivery flows. The trickiest parts are usually WhatsApp API rate limits and PDF stamping — both are very solvable with the right n8n workflow structure.

Fixed project works great — happy to scope it out and give you a clear timeline. Feel free to DM.

10

Hi!

I’ve carefully reviewed your technical requirements. Building a 100% dynamic, database-driven WhatsApp flow on a self-hosted n8n instance is exactly where my expertise lies. I specialize in creating “bulletproof” backends that handle complex branching logic and secure file delivery.

How I will execute your project:

  • Robust Infrastructure: I’ll set up Docker + n8n + Nginx/Traefik on your Hostinger VPS, ensuring secure local file mapping for your PDFs and optimized performance.

  • Dynamic UI/UX: I will build the dual-source database architecture (Technical/Non-Technical) using n8n logic that generates menus on the fly. I’ll ensure the “Back” button global requirement is met via state management in the workflow.

  • Advanced Anti-Abuse & Anti-Piracy: I’ll implement the mobile number purchase frequency check (FY limit) and the dynamic PDF watermarking (stamping Invoice/Timestamp) to protect your content.

  • Financial Logic: I will configure the dynamic switch from standard receipts to GST-compliant Razorpay Invoices once the ₹20 Lakh turnover threshold is reached.

  • Deliverability: Full SMTP setup with SPF, DKIM, and DMARC to guarantee your automated fulfillment emails hit the inbox, not the spam folder.

Why me?

  • I’m an n8n expert (handling Function nodes/JS, Split-in-batches, and complex Webhooks).

  • I have a deep understanding of the Meta/Chat Mitra API and payment gateway integrations (Razorpay).

  • Live Proof: My own website uses an automated n8n-to-Calendar flow. You can see examples of my complex n8n architectures here: https://mikedevai.netlify.app/

My Proposal:

  • Fixed Price Quote: $1000

  • Estimated Timeline: 14 days.

I’m ready to start with the “Skeleton Files” and your VPS immediately.

Let’s connect:

Looking forward to building this high-performance system for you!

Best regards,
Mihail

11

I run Evara AI, incubated at IIT Bhubaneswar, and WhatsApp automation systems are one of our primary delivery areas. I have built end-to-end WhatsApp bots with dynamic menu generation, session-based cart flows, and payment gateway integration – the architecture you are describing with n8n on a Hostinger VPS via Docker, SMTP notifications, and CSV-driven product catalogs is a stack I have deployed before. On the Razorpay side, I have implemented webhook-based payment confirmation flows that trigger automated file delivery and receipt generation through n8n. I am comfortable with the full loop: Docker deployment, n8n workflow design, WhatsApp Business API configuration, and the payment-to-delivery pipeline. DM me or reach out at [email protected] if you want to discuss the build scope.