Close round

Last updated Jun 14, 2026

Query Parameters

dry_runbooleanOptional

If true, simulate the mutation and return the would-be resource, any cascaded resources, and a fee estimate — without side effects. Available on every mutation.

Default false

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

closing_kindstringRequired

One of"full""partial""final_partial"

closing_datestring<date>Required

Format date

pro_formabooleanOptional

Run the cascade non-destructively and return the would-be results (SAFE conversion schedule, post-close cap table, fees) without committing. Equivalent to ?dry_run=true.

Default false

investor_ids_in_this_closearray<string>Optional

Required for closing_kind: partial. Subset of investors whose wire is being recognized in this tranche.

metadataobjectOptional

Flat string-to-string map. Up to 50 keys. Keys: max 40 chars, charset [A-Za-z0-9_\\-.]. Values: max 500 chars. Keys prefixed matter_ are reserved for platform use. Metadata is retrievable but not filterable via query params.

Response Body

`application/json`

`application/problem+json`

Request

curl -X POST "https://api.mattermode.com/v1/rounds/{id}/close" \  -H "Content-Type: application/json" \  -d '{    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }'

const body = JSON.stringify({  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}})fetch("https://api.mattermode.com/v1/rounds/{id}/close", {  method: "POST",  headers: {    "Content-Type": "application/json"  },  body})

package mainimport (  "fmt"  "net/http"  "io/ioutil"  "strings")func main() {  url := "https://api.mattermode.com/v1/rounds/{id}/close"  body := strings.NewReader(`{    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }`)  req, _ := http.NewRequest("POST", url, body)  req.Header.Add("Content-Type", "application/json")  res, _ := http.DefaultClient.Do(req)  defer res.Body.Close()  body, _ := ioutil.ReadAll(res.Body)  fmt.Println(res)  fmt.Println(string(body))}

import requestsheaders = {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",}payload = {    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [        "string"    ],    "metadata": {}}resp = requests.post(    "https://api.mattermode.com/v1/rounds/id_placeholder/close",    headers=headers,    json=payload,)resp.raise_for_status()print(resp.json())

import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;import java.net.http.HttpRequest.BodyPublishers;var body = BodyPublishers.ofString("""{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}""");HttpClient client = HttpClient.newBuilder()  .connectTimeout(Duration.ofSeconds(10))  .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()  .uri(URI.create("https://api.mattermode.com/v1/rounds/{id}/close"))  .header("Content-Type", "application/json")  .POST(body)  .build();try {  HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString());  System.out.println("Status code: " + response.statusCode());  System.out.println("Response body: " + response.body());} catch (Exception e) {  e.printStackTrace();}

using System;using System.Net.Http;using System.Text;var body = new StringContent("""{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}""", Encoding.UTF8, "application/json");var client = new HttpClient();var response = await client.PostAsync("https://api.mattermode.com/v1/rounds/{id}/close", body);var responseBody = await response.Content.ReadAsStringAsync();

curl --request POST 'https://api.mattermode.com/v1/rounds/id_placeholder/close' \  --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \  --header 'Matter-Version: 2026-06-10' \  --header 'Idempotency-Key: ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b' \  --header 'Content-Type: application/json' \  --data '{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}'

const response = await fetch("https://api.mattermode.com/v1/rounds/id_placeholder/close", {  method: "POST",  headers: {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",    "Content-Type": "application/json",  },  body: JSON.stringify({    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }),});if (!response.ok) {  throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);

Response

application/json

{
  "resource": {
    "id": "string",
    "object": "round",
    "entity_id": "ent_Nq3KcAbc",
    "name": "Waypoint Systems, Inc.",
    "kind": "seed_priced",
    "stage": "term_sheet",
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "intent": {
    "id": "string",
    "object": "intent",
    "goal": "form_startup_ready_corporation",
    "parameters": {},
    "status": "draft",
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "execution_plan": {
    "steps": [
      {
        "operation": "string",
        "status": "pending"
      }
    ]
  },
  "authorization": {
    "id": "string",
    "object": "authorization",
    "token_id": "tok_4Kj2m8pQ",
    "action": "string",
    "payload_hash": "string",
    "status": "pending",
    "expires_at": 1745539200,
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "pending_filings": [
    {
      "id": "string",
      "object": "filing",
      "entity_id": "ent_Nq3KcAbc",
      "type": "certificate_of_amendment",
      "jurisdiction": "US-DE",
      "status": "preparing",
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "cascaded_documents": [
    {
      "id": "string",
      "object": "document",
      "entity_id": "ent_Nq3KcAbc",
      "type": "certificate_of_incorporation",
      "status": "draft",
      "sha256": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
      "version": 1,
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "cascaded_resolutions": [
    {
      "id": "string",
      "object": "resolution",
      "entity_id": "ent_Nq3KcAbc",
      "kind": "board_meeting",
      "subject": "Approval of 2026 Equity Plan and initial pool of 2,000,000 shares",
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "events_emitted": [
    "string"
  ],
  "applied_defaults": [
    "string"
  ],
  "next_steps": [
    {
      "endpoint": "POST /v1/entities/ent_Nq3KcAbc/tax_elections",
      "reason": "Founder restricted-stock issuances require 83(b) within 30 days."
    }
  ]
}

{
  "type": "https://mattermode.com/docs/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Request body could not be parsed as JSON.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_request",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/authentication_required",
  "title": "Authentication required",
  "status": 401,
  "code": "authentication_required",
  "detail": "No bearer token was supplied. Pass `Authorization: Bearer sk_live_...` on every request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#authentication_required",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "code": "invalid_state_transition",
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved`; `dissolve` is not a valid transition.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "current_state": "dissolved",
  "attempted_transition": "dissolve",
  "allowed_transitions": []
}

{
  "type": "https://mattermode.com/docs/errors/dissolution_prerequisites_missing",
  "title": "Dissolution prerequisites missing",
  "status": 409,
  "code": "dissolution_prerequisites_missing",
  "detail": "Voluntary dissolution requires `board_resolution_id` and `stockholder_consent_id`, or `auto_generate_resolutions: true`.",
  "doc_url": "https://mattermode.com/docs/guides/errors#dissolution_prerequisites_missing",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/valuation_stale",
  "title": "409A valuation stale",
  "status": 409,
  "code": "valuation_stale",
  "detail": "Active 409A val_AbCd1234 is older than 12 months or superseded by a material event. Issuing ISOs at the prior strike risks IRC §409A violation. Refresh via POST /entities/{id}/valuations/{id}/refresh_request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#valuation_stale",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/validation_failed",
  "title": "Validation failed",
  "status": 422,
  "code": "validation_failed",
  "detail": "One or more fields failed validation. See `errors[]`.",
  "doc_url": "https://mattermode.com/docs/guides/errors#validation_failed",
  "request_id": "req_Qw9xYz8A",
  "errors": [
    {
      "field": "founders[0].equity",
      "code": "out_of_range",
      "message": "Equity must sum to 100% across all founders."
    }
  ]
}

{
  "type": "https://mattermode.com/docs/errors/rate_limit_exceeded",
  "title": "Rate limit exceeded",
  "status": 429,
  "code": "rate_limit_exceeded",
  "detail": "Request rate exceeded for this key. Retry after `retry_after` seconds or honor the `Retry-After` header.",
  "doc_url": "https://mattermode.com/docs/guides/errors#rate_limit_exceeded",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30
}

Cascade

A single call kicks off: {"kind":"ledger_entry","type":"safe_conversion","timing":"immediate","qualifier":"per_outstanding_safe"} → {"kind":"ledger_entry","type":"note_conversion","timing":"immediate","qualifier":"per_outstanding_note"} → {"kind":"ledger_entry","type":"issuance","timing":"immediate","qualifier":"per_investor"} → {"kind":"filing","type":"certificate_of_amendment","timing":"immediate"} → {"kind":"filing","type":"form_d","timing":"deferred","qualifier":"15_days_post_first_sale"} → {"kind":"filing","type":"blue_sky_notice","timing":"deferred","qualifier":"per_investor_state"} → {"kind":"document","type":"safe_conversion_schedule","timing":"immediate"} → {"kind":"cap_table_snapshot","timing":"immediate","qualifier":"post_close"}

Issue a priced roundSeries A close package — SAFE conversion, COI amendment, Form D, blue-sky notices.Issue a SAFESingle-investor pre-money or post-money SAFE issuance.Trigger an MFN cascadeRetroactively reprice MFN-flagged SAFEs across the cap table.

Close round.

Close the round. Triggers the full cascade: 1. SAFE / note conversion. For every outstanding SAFE / note, computes the conversion price per safe_type (pre-money / post-money / discount-only), valuation_cap, discount_rate, and mfn. Honors MFN by retroactively repricing if a later instrument has better terms. Accrues note interest to the conversion date. Generates a "SAFE Conversion Schedule" document. 2. COI amendment filed with state SOS authorizing the new preferred class. 3. Share-class issuance to each investor at the round's price-per-share. Creates share_ledger issuance entries. 4. Form D federal Reg D filing (Rule 503; due within 15 days of first sale). 5. Blue-sky notice filings per investor state (varies by state). 6. 409A material event — active 409A marked superseded; refresh queued. 7. Cap-table snapshot taken pre- and post-close. 8. Investor welcome packet generated and shared via signing envelope. Partial close is supported via closing_kind: partial. Tranches close sequentially without re-amending the COI; only the SPA references update. Set pro_forma: true (or ?dry_run=true) to preview the cascade — including the full SAFE conversion math — without committing.

Last updated Jun 14, 2026

Query Parameters

dry_runbooleanOptional

If true, simulate the mutation and return the would-be resource, any cascaded resources, and a fee estimate — without side effects. Available on every mutation.

Default false

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

closing_kindstringRequired

One of"full""partial""final_partial"

closing_datestring<date>Required

Format date

pro_formabooleanOptional

Run the cascade non-destructively and return the would-be results (SAFE conversion schedule, post-close cap table, fees) without committing. Equivalent to ?dry_run=true.

Default false

investor_ids_in_this_closearray<string>Optional

Required for closing_kind: partial. Subset of investors whose wire is being recognized in this tranche.

metadataobjectOptional

Response Body

`application/json`

`application/problem+json`

Request

curl -X POST "https://api.mattermode.com/v1/rounds/{id}/close" \  -H "Content-Type: application/json" \  -d '{    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }'

const body = JSON.stringify({  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}})fetch("https://api.mattermode.com/v1/rounds/{id}/close", {  method: "POST",  headers: {    "Content-Type": "application/json"  },  body})

package mainimport (  "fmt"  "net/http"  "io/ioutil"  "strings")func main() {  url := "https://api.mattermode.com/v1/rounds/{id}/close"  body := strings.NewReader(`{    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }`)  req, _ := http.NewRequest("POST", url, body)  req.Header.Add("Content-Type", "application/json")  res, _ := http.DefaultClient.Do(req)  defer res.Body.Close()  body, _ := ioutil.ReadAll(res.Body)  fmt.Println(res)  fmt.Println(string(body))}

import requestsheaders = {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",}payload = {    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [        "string"    ],    "metadata": {}}resp = requests.post(    "https://api.mattermode.com/v1/rounds/id_placeholder/close",    headers=headers,    json=payload,)resp.raise_for_status()print(resp.json())

import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;import java.net.http.HttpRequest.BodyPublishers;var body = BodyPublishers.ofString("""{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}""");HttpClient client = HttpClient.newBuilder()  .connectTimeout(Duration.ofSeconds(10))  .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()  .uri(URI.create("https://api.mattermode.com/v1/rounds/{id}/close"))  .header("Content-Type", "application/json")  .POST(body)  .build();try {  HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString());  System.out.println("Status code: " + response.statusCode());  System.out.println("Response body: " + response.body());} catch (Exception e) {  e.printStackTrace();}

using System;using System.Net.Http;using System.Text;var body = new StringContent("""{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}""", Encoding.UTF8, "application/json");var client = new HttpClient();var response = await client.PostAsync("https://api.mattermode.com/v1/rounds/{id}/close", body);var responseBody = await response.Content.ReadAsStringAsync();

curl --request POST 'https://api.mattermode.com/v1/rounds/id_placeholder/close' \  --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \  --header 'Matter-Version: 2026-06-10' \  --header 'Idempotency-Key: ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b' \  --header 'Content-Type: application/json' \  --data '{  "closing_kind": "full",  "closing_date": "2026-04-25",  "pro_forma": false,  "investor_ids_in_this_close": [    "string"  ],  "metadata": {}}'

const response = await fetch("https://api.mattermode.com/v1/rounds/id_placeholder/close", {  method: "POST",  headers: {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",    "Content-Type": "application/json",  },  body: JSON.stringify({    "closing_kind": "full",    "closing_date": "2026-04-25",    "pro_forma": false,    "investor_ids_in_this_close": [      "string"    ],    "metadata": {}  }),});if (!response.ok) {  throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);

Response

application/json

{
  "resource": {
    "id": "string",
    "object": "round",
    "entity_id": "ent_Nq3KcAbc",
    "name": "Waypoint Systems, Inc.",
    "kind": "seed_priced",
    "stage": "term_sheet",
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "intent": {
    "id": "string",
    "object": "intent",
    "goal": "form_startup_ready_corporation",
    "parameters": {},
    "status": "draft",
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "execution_plan": {
    "steps": [
      {
        "operation": "string",
        "status": "pending"
      }
    ]
  },
  "authorization": {
    "id": "string",
    "object": "authorization",
    "token_id": "tok_4Kj2m8pQ",
    "action": "string",
    "payload_hash": "string",
    "status": "pending",
    "expires_at": 1745539200,
    "created": 1745539200,
    "updated": 1745539200,
    "livemode": false
  },
  "pending_filings": [
    {
      "id": "string",
      "object": "filing",
      "entity_id": "ent_Nq3KcAbc",
      "type": "certificate_of_amendment",
      "jurisdiction": "US-DE",
      "status": "preparing",
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "cascaded_documents": [
    {
      "id": "string",
      "object": "document",
      "entity_id": "ent_Nq3KcAbc",
      "type": "certificate_of_incorporation",
      "status": "draft",
      "sha256": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
      "version": 1,
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "cascaded_resolutions": [
    {
      "id": "string",
      "object": "resolution",
      "entity_id": "ent_Nq3KcAbc",
      "kind": "board_meeting",
      "subject": "Approval of 2026 Equity Plan and initial pool of 2,000,000 shares",
      "created": 1745539200,
      "updated": 1745539200,
      "livemode": false
    }
  ],
  "events_emitted": [
    "string"
  ],
  "applied_defaults": [
    "string"
  ],
  "next_steps": [
    {
      "endpoint": "POST /v1/entities/ent_Nq3KcAbc/tax_elections",
      "reason": "Founder restricted-stock issuances require 83(b) within 30 days."
    }
  ]
}

{
  "type": "https://mattermode.com/docs/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Request body could not be parsed as JSON.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_request",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/authentication_required",
  "title": "Authentication required",
  "status": 401,
  "code": "authentication_required",
  "detail": "No bearer token was supplied. Pass `Authorization: Bearer sk_live_...` on every request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#authentication_required",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "code": "invalid_state_transition",
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved`; `dissolve` is not a valid transition.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "current_state": "dissolved",
  "attempted_transition": "dissolve",
  "allowed_transitions": []
}

{
  "type": "https://mattermode.com/docs/errors/dissolution_prerequisites_missing",
  "title": "Dissolution prerequisites missing",
  "status": 409,
  "code": "dissolution_prerequisites_missing",
  "detail": "Voluntary dissolution requires `board_resolution_id` and `stockholder_consent_id`, or `auto_generate_resolutions: true`.",
  "doc_url": "https://mattermode.com/docs/guides/errors#dissolution_prerequisites_missing",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/valuation_stale",
  "title": "409A valuation stale",
  "status": 409,
  "code": "valuation_stale",
  "detail": "Active 409A val_AbCd1234 is older than 12 months or superseded by a material event. Issuing ISOs at the prior strike risks IRC §409A violation. Refresh via POST /entities/{id}/valuations/{id}/refresh_request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#valuation_stale",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/validation_failed",
  "title": "Validation failed",
  "status": 422,
  "code": "validation_failed",
  "detail": "One or more fields failed validation. See `errors[]`.",
  "doc_url": "https://mattermode.com/docs/guides/errors#validation_failed",
  "request_id": "req_Qw9xYz8A",
  "errors": [
    {
      "field": "founders[0].equity",
      "code": "out_of_range",
      "message": "Equity must sum to 100% across all founders."
    }
  ]
}

{
  "type": "https://mattermode.com/docs/errors/rate_limit_exceeded",
  "title": "Rate limit exceeded",
  "status": 429,
  "code": "rate_limit_exceeded",
  "detail": "Request rate exceeded for this key. Retry after `retry_after` seconds or honor the `Retry-After` header.",
  "doc_url": "https://mattermode.com/docs/guides/errors#rate_limit_exceeded",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30
}

Cascade

Close round.

202application/json

400application/problem+json

401application/problem+json

409application/problem+json

422application/problem+json

429application/problem+json

Close round.

202application/json

400application/problem+json

401application/problem+json

409application/problem+json

422application/problem+json

429application/problem+json

`application/json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`