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$
USD
I will integrate invoice API, accounting API, xero, quickbooks and zoho books
augustin
About this gig
Need to connect your website, SaaS, dashboard or custom application to an accounting or invoicing platform?
I can integrate and troubleshoot accounting APIs, invoice APIs and expense APIs for your existing application.
I work with QuickBooks API, Xero API, FreshBooks API, Wave API and Zoho Books, depending on your project requirements.
My services include:
- Invoice API integration
- Accounting API integration
- Expense API integration
- Customer and payment sync
- Invoice creation and retrieval
- Expense data synchronization
- API authentication and OAuth
- Webhook integration
- REST API connection
- Data mapping and synchronization
- API troubleshooting and bug fixing
- Invoice automation workflows
I can connect your accounting platform to a website, SaaS product, CRM, dashboard or custom backend using your existing API documentation and requirements.
Whether you need a new integration, an API fix, data synchronization or invoice automation, I can help build a clean and reliable solution.
Please message me with your API documentation and project requirements before ordering so I can recommend the right integration approach.
Get to know augustin
augustin
AI API Integration Developer, Voice AI, ElevenLabs, Whisper, Deepgram
- FromUnited Kingdom
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English
I'm an API integration developer i help businesses integrate ElevenLabs API, Deepgram API, Whisper API, AssemblyAI API, Speech-to-Text, Text-to-Speech, Voice AI, AI Voice Assistant, Audio Transcription, Speech Recognition, webhooks, REST APIs, and automation workflows.
Whether you're building an AI call assistant, customer support chatbot, voice automation platform, podcast transcription system, or conversational AI application, I deliver clean, scalable, and well-documented integrations focused on performance, reliability, and security.
FAQ
Can you integrate QuickBooks API with my existing application?
Yes. I can connect QuickBooks API to an existing website, SaaS, dashboard or backend for supported accounting workflows.
Can you integrate Xero API for invoices and expenses?
Yes. I can implement Xero API integration for supported invoice, customer, payment and expense workflows.
Do you work with FreshBooks API and Wave API?
Yes. I can work with FreshBooks API and Wave API when the required functionality is available through their API.
Can you integrate Zoho Books?
Yes. I can integrate Zoho Books for supported accounting, invoice, customer and expense workflows.
Can you fix an existing accounting API integration?
Yes. I can troubleshoot authentication, API requests, webhooks, data mapping and other integration issues.
Can you automate invoice creation?
Yes. I can build invoice automation workflows when the selected accounting or invoice API supports the required operations.
Can you synchronize expenses and invoices?
Yes. I can create supported expense and invoice synchronization between your application and the accounting platform.
What do you need before starting?
I normally need your API documentation, application details, credentials or sandbox access where applicable, and a clear description of the workflow you need.
