Writes and POSTing Data with Merge’s Accounting Unified API
Last updated: February 5, 2026
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What are your available POST endpoints, and what can I do with them?
Our Accounting Unified API is able to support a wide array of use cases dependent on POSTing data. The endpoints in the below table can be utilized to meet your Accounting data needs!
All of the endpoints below start with a base URL of https://api.merge.dev/api/accounting/v1.
If you are in the EU tenant, use this base URL: https://api-eu.merge.dev/api/accounting/v1
If you are in the APAC tenant, use this base URL: https://api-ap.merge.dev/api/accounting/v1
What endpoints do you support it? | What does it do? | Which integrations do you support, and where can I learn more? |
POST /Account | Add a new bank account or general ledger account. | See our most up-to-date model and support in our docs. |
POST /Attachments | Create an attachment. | See our most up-to-date model and support in our docs. |
POST /Contacts | Add a new vendor or customer. | See our most up-to-date model and support in our docs. |
POST /Credit-Notes POST /credit-notes/{id}/application | Creates a new credit note. Applies a credit note to an invoice. | See our most up-to-date model and support in our docs. |
POST /Expenses | Records a new expense. | See our most up-to-date model and support in our docs. |
POST /Invoices | Create an invoice or bill (when the | See our most up-to-date model and support in our docs. |
POST /Items | Create a new item. | See our most up-to-date model and support in our docs. |
POST /Journal-Entries | Creates a journal entry. | See our most up-to-date model and support in our docs. |
POST /Payments to Journal or Invoice | Add payments to existing Invoices or Journal Entries. | See our most up-to-date model and support in our docs. |
POST /Purchase Order | Create a purchase order. | See our most up-to-date model and support in our docs. |
POST /Vendor-Credits POST /vendor-notes/{id}/application | Creates a new vendor credit. Applies a vendor credit to an invoice. | See our most up-to-date model and support in our docs. |
Have a Question About Your Use Case?
If you’re wondering if a specific action is possible through our API, don’t hesitate to reach out through Intercom or to [email protected]: we’re always happy to help!