--- title: Connect To Your Customers Accounting, HR And CRM Systems... description: Merge provides a single Unified API that sits in front of many accounting, HR, ATS and CRM systems, letting a product or AI assistant read and write invoices,... canonical: https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Connect To Your Customers Accounting, HR And CRM Systems With Merge | daily.dev og:description: Merge provides a single Unified API that sits in front of many accounting, HR, ATS and CRM systems, letting a product or AI assistant read and write invoices,... og:url: https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy og:image: https://api.daily.dev/og/posts/8WbucSJYY.png og:image:alt: Connect To Your Customers Accounting, HR And CRM Systems With Merge og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Connect To Your Customers Accounting, HR And CRM Systems With Merge **[API Evangelist](https://daily.dev/sources/apievangelist)** · 4 min read · 0 upvotes · 0 comments ## Summary Merge provides a single Unified API that sits in front of many accounting, HR, ATS and CRM systems, letting a product or AI assistant read and write invoices, candidates, payroll and deals the same way regardless of which backend system a customer uses. It covers HRIS, ATS, accounting, CRM, ticketing, file storage, knowledge bases and chat, plus Agent Handler for pre-built enterprise connectors and Gateway for unified LLM access. Example endpoints include GET /accounting/v1/invoices and PATCH /crm/v1/opportunities/{id}. APIs.io catalogs 19 workflows for Merge, such as linking an accounting account or advancing an application stage. Merge is a paid, hosted service. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How can my app read and write invoices across different accounting systems customers use without building a separate integration for each one? Merge's Financial Management API provides a single interface across accounting platforms: GET /accounting/v1/invoices lists invoices such as unpaid ones, POST /accounting/v1/invoices creates one, GET /accounting/v1/invoices/{id} returns line items and totals, and PATCH /accounting/v1/invoices/{id} updates an existing invoice, all without writing separate code per accounting platform. _Teams weighing a unified API against building per-system integrations can track approaches like this one on daily.dev._ ### What does Merge's Unified API cover besides accounting? Merge's Unified API spans HRIS (HR information systems), ATS (applicant tracking systems), accounting, CRM, ticketing, file storage, knowledge bases and chat. It also offers Agent Handler, which exposes pre-built enterprise connectors to AI agents, and Gateway, a unified API across several large language model providers. _Developers evaluating integration platforms for B2B products can follow coverage of tools like this on daily.dev._ ## Similar posts on daily.dev - [Unify your productivity and AI data with Lakeflow Connect](https://daily.dev/posts/unify-your-productivity-and-ai-data-with-lakeflow-connect-tga8fput1) · databricks · 0 upvotes · 0 comments - [Merge queue APIs now available in Bitbucket Cloud](https://daily.dev/posts/merge-queue-apis-now-available-in-bitbucket-cloud-zwqwju2if) · Atlassian · 0 upvotes · 0 comments - [Customer Intelligence Hub for Real-Time GTM Insights](https://daily.dev/posts/customer-intelligence-hub-for-real-time-gtm-insights-bmumedt98) · Confluent Blog · 2 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents) [View this post on daily.dev](https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Connect To Your Customers Accounting, HR And CRM Systems With Merge","url":"https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy"},"datePublished":"2026-10-28T18:24:12.320Z","dateModified":"2026-10-28T18:39:05.900Z","description":"Merge provides a single Unified API that sits in front of many accounting, HR, ATS and CRM systems, letting a product or AI assistant read and write invoices,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bde50853382c195f9fe10efa3ccb581d?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bde50853382c195f9fe10efa3ccb581d?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"API Evangelist","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"API Evangelist","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/a36244ae67bc4f41a605f780267ecb5f","url":"https://daily.dev/sources/apievangelist"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ai-agents","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"API Evangelist","item":"https://daily.dev/sources/apievangelist"},{"@type":"ListItem","position":3,"name":"Connect To Your Customers Accounting, HR And CRM Systems With Merge"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/connect-to-your-customers-accounting-hr-and-crm-systems-with-merge-8wbucsjyy#faq","mainEntity":[{"@type":"Question","name":"How can my app read and write invoices across different accounting systems customers use without building a separate integration for each one?","acceptedAnswer":{"@type":"Answer","text":"Merge's Financial Management API provides a single interface across accounting platforms: GET /accounting/v1/invoices lists invoices such as unpaid ones, POST /accounting/v1/invoices creates one, GET /accounting/v1/invoices/{id} returns line items and totals, and PATCH /accounting/v1/invoices/{id} updates an existing invoice, all without writing separate code per accounting platform. 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