Payer API
Payer provides a modern B2B payments platform with APIs for payment initiation, invoice management, and reporting.
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OpenAPI Specification
openapi: 3.1.0
info:
title: Payer API
version: '2026-10-15'
description: 'GENERATED FROM DOCUMENTATION by API Evangelist on 2026-10-15: 33 operation(s) read from 12 public documentation page(s) (each
operation names its page in x-source). This is not the provider''s published contract; Payer has published no machine-readable contract that
the pipeline could find. Engine: local.'
x-evidence-tiers:
code-example: 6
documentation: 27
pages-with-code: 5
pages-read: 12
x-generated-from: documentation
x-provenance: generated
x-authored-by: API Evangelist
x-generated: '2026-10-15'
x-generator: generate-contract-from-docs.py
x-engine: local
x-sources:
- https://docs.developerhub.io/api/ref
- https://docs.developerhub.io/api.md?operation=add-reference
- https://docs.developerhub.io/api.md?operation=publish-reference
- https://docs.developerhub.io/support-center/api-reference-faq.md
- https://docs.developerhub.io/support-center/api-reference-settings.md
- https://docs.developerhub.io/api.md?operation=read-reference-definition
- https://docs.developerhub.io/support-center/api-key.md
- https://docs.developerhub.io/api.md?operation=all-project
- https://docs.developerhub.io/support-center/code-generation.md
- https://payerdocs.developerhub.io/payer-docs/b2b-invoicing---quickstart
- https://payerdocs.developerhub.io/payer-docs/events-api-and-subscribing-to-events
- https://payerdocs.developerhub.io/payer-b2b/ref
servers:
- url: https://b2b.payer.se
paths:
/:
get:
operationId: get
tags:
- Api
summary: GET /
x-source: https://docs.developerhub.io/support-center/code-generation.md
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: code-example
language: curl
snippet: 'curl](https://curl.haxx.se/) (Bash)
- [request](https://www.npmjs.com/package/request) (Node.js)
- [Requests](https://pypi.org/project/requests/2.7.0/) (Python)
- [net/http](https://golang.org/pkg/net/http/) (Go)
- [Guzzle](https://docs.guzzlephp.org/en/stable/) (PHP)
- [HttpClient](https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclient?view=net-5.0) (C#)
- [OkHttp](https://square.'
/all:
get:
operationId: get_all
tags:
- All
summary: Get all resources
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/api/v1/events/callbacks:
post:
operationId: post_api_v1_events_callbacks
tags:
- Api
summary: Subscribe to events
x-source: https://payerdocs.developerhub.io/payer-docs/events-api-and-subscribing-to-events
parameters:
- name: type
in: query
required: true
schema:
type: string
description: The event type to subscribe to (e.g., INVOICE_PAYMENT_RECEIVED).
- name: url
in: query
required: true
schema:
type: string
description: The callback URL where the event payload will be sent.
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
/api/v1/page:
get:
operationId: get_api_v1_page
tags:
- Api
summary: GET /api/v1/page
x-source: https://docs.developerhub.io/support-center/api-reference-settings.md
parameters:
- name: documentation_id
in: query
required: false
schema:
type: string
- name: documentation_slug
in: query
required: false
schema:
type: string
- name: format
in: query
required: false
schema:
type: string
- name: page_slug
in: query
required: false
schema:
type: string
- name: version_id
in: query
required: false
schema:
type: string
- name: version_slug
in: query
required: false
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: code-example
language: curl
snippet: 'curl --request GET --url https://api.developerhub.io/api/v1/page?version_id={version_id}&version_slug={version_slug}&documentation_id={documentation_id}&documentation_slug={documentation_slug}&page_slug={page_slug}&format={format} --header
"Accept: application/json"
```'
/api/v2/orders/invoices:
get:
operationId: get_api_v2_orders_invoices
tags:
- Api
summary: Returns an invoice for a given invoice number.
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
responses:
'200':
description: Success (status as documented)
content:
application/json:
schema:
$ref: '#/components/schemas/GetApiV2OrdersInvoicesResponse'
x-evidence:
kind: documentation
/api/v2/orders/invoices/credit/{creditid}:
post:
operationId: post_api_v2_orders_invoices_credit_creditid
tags:
- Api
summary: Returns a credit invoice for the full amount of the provided invoice.
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
parameters:
- name: creditid
in: path
required: true
schema:
type: string
requestBody:
required: false
content:
application/json:
schema:
$ref: '#/components/schemas/PostApiV2OrdersInvoicesCreditCreditidRequest'
responses:
'201':
description: Success (status as documented)
content:
application/json:
schema:
$ref: '#/components/schemas/PostApiV2OrdersInvoicesCreditCreditidResponse'
x-evidence:
kind: documentation
collapsed_from: 3 example path(s) differing only at creditId
/api/v2/orders/invoices/send:
put:
operationId: put_api_v2_orders_invoices_send
tags:
- Api
summary: Sends a copy of an invoice.
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
requestBody:
required: false
content:
application/json:
schema:
$ref: '#/components/schemas/PutApiV2OrdersInvoicesSendRequest'
responses:
'200':
description: Success (status as documented)
content:
application/json:
schema:
$ref: '#/components/schemas/PutApiV2OrdersInvoicesSendResponse'
x-evidence:
kind: documentation
/api/v2/orders/invoices/{invoiceid}:
get:
operationId: get_api_v2_orders_invoices_invoiceid
tags:
- Api
summary: Returns invoices with invoice number >= than given invoice number.
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
parameters:
- name: invoiceid
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
content:
application/json:
schema:
$ref: '#/components/schemas/GetApiV2OrdersInvoicesInvoiceidResponse'
x-evidence:
kind: documentation
collapsed_from: 3 example path(s) differing only at invoiceId
post:
operationId: post_api_v2_orders_invoices_invoiceid
tags:
- Api
summary: Pays an invoice with an outstanding amount from a credit invoice.
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
parameters:
- name: invoiceid
in: path
required: true
schema:
type: string
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/PostApiV2OrdersInvoicesInvoiceidRequest'
responses:
'201':
description: Success (status as documented)
content:
application/json:
schema:
$ref: '#/components/schemas/PostApiV2OrdersInvoicesInvoiceidResponse'
x-evidence:
kind: documentation
collapsed_from: 2 example path(s) differing only at invoiceId
/api/v3/invoices:
post:
operationId: post_api_v3_invoices
tags:
- Api
summary: POST /api/v3/invoices
x-source: https://payerdocs.developerhub.io/payer-docs/b2b-invoicing---quickstart
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: code-example
language: curl
snippet: 'curl --request POST \ --url ''https://b2b.payer.se/api/v3/invoices'' \ --header ''Authorization: Bearer {token}'' \ --data ''{
"invoiceCustomer": { "address": { "companyName": "ABC Corp", "emailAddress": "customer@example.com", "streetAddress1": "123 Main Street",
"zipCode": "12345", "city": "Stockholm", "countryCode": "SE" // Additional fields is be added here, such as phoneNumber, email etc.
}, // Ad'
/audit:
get:
operationId: get_audit
tags:
- Audit
summary: Get audit log
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/changelog/{id}/post:
get:
operationId: get_changelog_id_post
tags:
- Changelog
summary: List changelog posts
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
post:
operationId: post_changelog_id_post
tags:
- Changelog
summary: Create a changelog post
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
/documentation/{id}/page:
post:
operationId: post_documentation_id_page
tags:
- Documentation
summary: Create a page
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
/export:
get:
operationId: get_export
tags:
- Export
summary: Exports project
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/oauth2/token:
post:
operationId: post_oauth2_token
tags:
- Oauth2
summary: POST /oauth2/token
x-source: https://payerdocs.developerhub.io/payer-b2b/ref
responses:
'201':
description: Success (shape read from the example response on the page)
content:
application/json:
schema:
$ref: '#/components/schemas/PostOauth2TokenResponse'
x-evidence:
kind: code-example
language: curl
snippet: "curl -X POST https://b2b.payer.se/oauth2/token -H 'Accept: application/json' -H 'Authorization: Basic <credentials>' -H\
\ 'Content-Type: application/x-www-form-urlencoded' -d grant_type=client_credentials \n The POST will return a JSON response containing\
\ an OAuth2 Bearer token: \n {\n \"access_token\": \"some-very-long-token\",\n \"expires_in\": 3599,\n \"scope\": \"\",\n \"token_type\"\
: \"bearer\"\n} For all othe"
/page:
get:
operationId: get_page
tags:
- Page
summary: Get page by slug
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/page/{id}:
delete:
operationId: delete_page_id
tags:
- Page
summary: Delete a page
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
get:
operationId: get_page_id
tags:
- Page
summary: Read page
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
put:
operationId: put_page_id
tags:
- Page
summary: Update a page
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/page/{id}/publish:
put:
operationId: put_page_id_publish
tags:
- Page
summary: Publish a page
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/reader-access:
get:
operationId: get_reader_access
tags:
- Reader Access
summary: Get access details of all invited readers
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
patch:
operationId: patch_reader_access
tags:
- Reader Access
summary: Revoke access to reader
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
post:
operationId: post_reader_access
tags:
- Reader Access
summary: Grant access to reader
x-source: https://docs.developerhub.io/api/ref
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
/reference/{id}/definition:
get:
operationId: get_reference_id_definition
tags:
- Reference
summary: Read a reference specification
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/reference/{id}/publish:
put:
operationId: put_reference_id_publish
tags:
- Reference
summary: Publish a reference draft
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/search:
get:
operationId: get_search
tags:
- Search
summary: Search content
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/users:
get:
operationId: get_users
tags:
- Users
summary: Get users
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/version:
get:
operationId: get_version
tags:
- Version
summary: Lists all project versions
x-source: https://docs.developerhub.io/api/ref
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/version/{id}:
put:
operationId: put_version_id
tags:
- Version
summary: Update a version
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
/version/{id}/clone:
post:
operationId: post_version_id_clone
tags:
- Version
summary: Clone a version
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
/version/{id}/{id}:
get:
operationId: get_version_id_id
tags:
- Version
summary: Get broken links report
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: id
in: path
required: true
schema:
type: string
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Success (status as documented)
x-evidence:
kind: documentation
collapsed_from: 3 example path(s) differing only at id
/version/{versionid}/reference:
post:
operationId: post_version_versionid_reference
tags:
- Version
summary: Adds or updates a reference specification
x-source: https://docs.developerhub.io/api/ref
parameters:
- name: versionid
in: path
required: true
schema:
type: string
responses:
'201':
description: Success (status as documented)
x-evidence:
kind: documentation
components:
schemas:
GetApiV2OrdersInvoicesResponse:
type: object
properties:
'200':
type: object
description: Invoice data.
PostApiV2OrdersInvoicesCreditCreditidRequest:
type: object
properties:
deliveryType:
type: string
description: Delivery type.
externalInvoiceNumber:
type: string
description: External invoice number.
invoiceDate:
type: string
description: Invoice date.
invoiceNumber:
type: integer
description: Invoice number.
referenceId:
type: string
description: Reference ID.
standalone:
type: boolean
description: Standalone flag.
PostApiV2OrdersInvoicesCreditCreditidResponse:
type: object
properties:
'200':
type: object
description: Created credit invoice.
PutApiV2OrdersInvoicesSendRequest:
type: object
properties:
address:
type: object
description: Address object with 13 fields.
deliveryType:
type: string
description: Delivery type.
emailCC:
type: array
description: CC email addresses.
emailTo:
type: string
description: Recipient email.
gln:
type: string
description: GLN.
invoiceNumber:
type: integer
description: Invoice number.
smsNumber:
type: string
description: SMS number.
PutApiV2OrdersInvoicesSendResponse:
type: object
properties:
'200':
type: string
description: No response body.
GetApiV2OrdersInvoicesInvoiceidResponse:
type: object
properties:
'200':
type: array
description: Batch of invoices.
PostApiV2OrdersInvoicesInvoiceidRequest:
type: object
properties:
amount:
type: integer
description: Amount to pay.
creditInvoiceNumber:
type: integer
description: Credit invoice number.
toPayInvoiceAggregationId:
type: string
description: Monthly invoice statement ID.
toPayInvoiceNumber:
type: integer
description: Invoice number to pay.
required:
- amount
- creditInvoiceNumber
PostApiV2OrdersInvoicesInvoiceidResponse:
type: object
properties:
'200':
type: string
description: No response body.
PostOauth2TokenResponse:
type: object
properties:
access_token:
type: string
expires_in:
type: integer
scope:
type: string
token_type:
type: string
securitySchemes:
bearer:
type: http
scheme: bearer
security:
- bearer: []
tags:
- name: All
- name: Api
- name: Audit
- name: Changelog
- name: Documentation
- name: Export
- name: Oauth2
- name: Page
- name: Reader Access
- name: Reference
- name: Search
- name: Users
- name: Version