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SaaS B2B Invoicing & Billing Software Development

SaaS B2B Invoicing & Billing Software Development

A multi-tenant cloud invoicing software platform that helps small and mid-sized B2B businesses automate one-time and recurring invoices, collect signed agreements before payment, and track FluidPay transactions in real time, built on Azure serverless architecture.

SaaS B2B Invoicing & Billing Software Development

Project Overview

Small and mid-sized B2B businesses were struggling with manual invoicing. Payment statuses lagged, due and overdue reminders were sent by hand, and agreements were signed outside the payment process, slowing collections and increasing errors and disputes. Ditstek built a B2B invoicing software platform that brings one-time and recurring invoices, customer management, payment agreements, and billing schedules into one invoice management system. As an Azure serverless transformation of the billing process, it delivers high scalability, lower infrastructure costs, and minimal maintenance, with each business working from its own secure subdomain.

Overcoming Core Challenges in Building B2B Invoicing

Addressing the critical gaps in automation, integration, and payment workflows to deliver a secure, real-time, and user-centric recurring invoice software platform for modern B2B businesses.

  • No Real-Time Payment Visibility

    No Real-Time Payment Visibility

    Invoice statuses depended on constant polling, so businesses could not see transactions instantly, which weakened financial planning and slowed down everyday billing and finance operations.

  • Data Mismatches with FluidPay

    Data Mismatches with FluidPay

    Sync delays between the platform and the FluidPay payment API caused mismatches in customer records, payments, and invoice statuses, making it hard to trust billing data.

  • Manual Collections Follow-Up

    Manual Collections Follow-Up

    Without automated reminders for due or overdue invoices, finance teams chased every payment by hand, and delayed payments made cash flow inconsistent from one month to the next.

  • Broken Payment Journey

    Broken Payment Journey

    Sending customers to external e-signature platforms interrupted the payment journey, adding extra steps between invoice and payment and reducing the number of customers who completed both.

  • Manual Agreement Creation

    Manual Agreement Creation

    There was no way to generate agreements automatically based on payment preferences, so manual contract handling slowed customer onboarding and created extra work for every new account.

  • Compliance and Error Risk

    Compliance and Error Risk

    Handling contracts manually and outside the payment flow increased the risk of errors, disputes, and non-compliance, with no reliable link between signed agreements and invoices.

Smart Solutions to Power B2B Invoicing Software

Ditstek delivered a billing platform modernization for B2B businesses, combining Azure serverless architecture, real-time payment sync, automated reminders, and in-platform agreement signing to replace manual invoicing with end-to-end billing workflow automation.

FluidPay Webhooks

FluidPay Webhooks

FluidPay webhooks replaced constant polling, so invoice statuses update the moment a payment event happens and businesses can track every transaction in real time from one dashboard.

Bi-Directional API Sync

Bi-Directional API Sync

Bi-directional API synchronization between the platform and FluidPay keeps customer, payment, and invoice data consistent across both systems, removing the mismatches that previously caused confusion.

Automated Daily Reminders

Automated Daily Reminders

Azure Functions Timer Triggers send daily due and overdue invoice reminders by email and SMS through SendGrid and Twilio, keeping follow-ups consistent without manual effort.

Drag-and-Drop Agreement Builder

Drag-and-Drop Agreement Builder

Businesses build dynamic agreements based on payment type using a drag-and-drop builder, so the right contract is generated automatically for every customer and billing arrangement.

Built-In E-Signature and Payment

Built-In E-Signature and Payment

A custom e-signature module lets customers sign the agreement first, then pay through an embedded FluidPay payment form, completing the whole journey without leaving the page.

Secure Agreement Storage

Secure Agreement Storage

Every signed agreement is stored securely and linked automatically to its invoice, giving businesses a clear, reliable record of what each customer agreed to before paying.

Robust Features Powering Invoicing Ecosystem

Built as recurring invoice software for small and mid-sized B2B businesses, the platform covers the full billing cycle, from customer setup and agreements to invoicing, payments, reminders, and real-time reporting across every tenant.

Recurring Invoice Management

Recurring Invoice Management

Set flexible billing intervals for repeat clients, and the platform automatically generates and sends invoices on schedule, supporting subscription billing transformation for long-term payment cycles.

Agreement Builder & Pre-Payment Signing

Agreement Builder & Pre-Payment Signing

Create dynamic agreements by payment type with a drag-and-drop builder. Customers sign digitally before payment, and each agreement is stored securely and linked to its invoice.

Real-Time Payment Sync

Real-Time Payment Sync

FluidPay webhooks and bi-directional APIs update invoice and payment statuses instantly, keeping customer records, transactions, and invoices consistent across both the platform and payment gateway.

Automated Reminders & Notifications

Automated Reminders & Notifications

SendGrid and Twilio deliver invoice reminders, overdue alerts, and payment confirmations by email and SMS, bringing billing workflow automation to every step of the collections process.

Multi-Tenant SaaS Structure

Multi-Tenant SaaS Structure

Each business runs in a secure, dedicated portal under its own subdomain, with its own CRM, settings, and branding, ensuring full data isolation and easy scaling.

Customer Management (CRM)

Customer Management (CRM)

Add, edit, and manage customer profiles with complete invoice histories, payment records, and linked agreements, so every account's full billing history sits in one place.

Custom Invoice Templates

Choose ready-made invoice themes or request customized versions with admin approval, giving every business consistent, professional branding on each invoice it sends to its customers.

Real-Time Dashboards

Visual KPIs such as total invoices, overdue bills, active customers, and upcoming payments help businesses understand their billing position and make decisions at a glance.

Multi-Portal Architecture

Multi-Portal Architecture

A Marketing Portal handles business sign-up, a Super Admin portal manages approvals and the platform, and a Business Admin portal runs daily invoicing and customer operations.

Tech Implementation

  • React
  • Redux
  • TypeScript
  • .NET Core
  • Azure App Services
  • SendGrid
  • Twilio
  • Azure DevOps

Measurable Impact That Transformed B2B Invoicing Operations

From reduced manual workload to improved cash flow and security, the platform delivered significant business value through automation, scalability, and real-time capabilities tailored for modern B2B invoicing needs.

60–70% Less Manual Billing Work

60–70% Less Manual Billing Work

This SaaS billing transformation automated recurring invoices and reminders, eliminating 60–70% of manual billing work and freeing finance teams to focus on higher-value work instead of routine admin.

Faster Payment Cycles

Faster Payment Cycles

Automated reminders and real-time invoice tracking led to faster payment cycles, helping businesses maintain healthier cash flow and spend less time on manual collections follow-up.

Stronger Payment Security & Trust

Stronger Payment Security & Trust

Requiring agreement signing before payment strengthened customer trust, legal protection, and transaction transparency, adding a clear compliance layer to every invoice and payment the platform processes.

Real-Time Financial Visibility

Real-Time Financial Visibility

With webhook-driven status updates and live dashboards, businesses now see payments as soon as they happen, making financial planning and daily operations more accurate and predictable.

Smoother Customer Onboarding

Smoother Customer Onboarding

This invoice management transformation replaced manual contracts with automated, in-platform agreements, speeding up customer onboarding and reducing errors, disputes, and compliance risks across every account.

Easy Scaling for New Businesses

Easy Scaling for New Businesses

The multi-tenant SaaS modernization makes onboarding new businesses simple, giving each one a dedicated environment with brand control while the platform scales without compromising performance.

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