7️⃣Card Issuance

This step assumes you have successfully created a new account record using Account Creationstep of the guide

Now that you have created a customer account, you are able to issue cards for the account. To do so, you need to use /accounts/{accountId}/card POST request.

Create new card

post

Creates new card for the account

Authorizations
Path parameters
accountIdstring · uuidRequired

Unique account ID

Header parameters
SignaturestringRequired

HTTP message signature

Signature-InputstringRequired

HTTP message signature input

Idempotency-Keystring · uuidRequired

Idempotency key (UUID)

Content-DigeststringRequired

Content digest

Body
typestring · enumRequired

Card type

Possible values:
Responses
201

Successful operation

application/json
post
POST /v1/accounts/{accountId}/cards HTTP/1.1
Host: api.offblocks.xyz
Authorization: Bearer JWT
Signature: text
Signature-Input: text
Idempotency-Key: 123e4567-e89b-12d3-a456-426614174000
Content-Digest: text
Content-Type: application/json
Accept: */*
Content-Length: 299

{
  "type": "virtual",
  "billingAddress": {
    "firstLine": "Flat G",
    "secondLine": "321 West End Lane",
    "city": "London",
    "state": "text",
    "country": "GB",
    "postCode": "NW6 2FG"
  },
  "shippingAddress": {
    "firstLine": "Flat G",
    "secondLine": "321 West End Lane",
    "city": "London",
    "state": "text",
    "country": "GB",
    "postCode": "NW6 2FG"
  }
}
{
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "accountId": "123e4567-e89b-12d3-a456-426614174000",
  "type": "virtual",
  "name": "John Carter",
  "network": "visa",
  "maskedPan": "530518******9871",
  "expirationDate": "10/2028",
  "billingAddress": {
    "firstLine": "Flat G",
    "secondLine": "321 West End Lane",
    "city": "London",
    "state": "text",
    "country": "GB",
    "postCode": "NW6 2FG"
  },
  "status": "issuing",
  "createdAt": "2025-08-22T20:29:51.295Z",
  "updatedAt": "2025-08-22T20:29:51.295Z"
}

Let's say we want to open a new virtual card (physical cards are not supported at the moment):

{
  "type": "virtual",
  "billingAddress": {
    "firstLine": "1 Test Avenue",
    "city": "London",
    "country": "GB",
    "postCode": "SW1 1AA"
  }
}

If everything was successful, you will receive a response with status 201 (Created) which looks similar to the following:

{
    "accountId": "ae61c362-4136-49af-8e01-544457fe265b",
    "billingAddress": {
        "city": "London",
        "country": "GB",
        "firstLine": "1 Test Avenue",
        "postCode": "SW1 1AA"
    },
    "createdAt": "2024-01-12T15:12:26.923705379Z",
    "id": "fc4912aa-cac9-4bb0-a6a7-6ec50bf45879",
    "status": "issuing",
    "type": "virtual",
    "updatedAt": "2024-01-12T15:12:26.923705379Z"
}

At this stage, you can use our Simulator to issue or fail a pending card issuance request.

Assuming you would like to issue the card and proceed with next steps, you need to make an empty PATCH request to /simulator/cards/{cardId}/issue.

Issue card

patch

Simulates card issuing success

Authorizations
Path parameters
cardIdstring · uuidRequired

Unique card ID

Header parameters
SignaturestringRequired

HTTP message signature

Signature-InputstringRequired

HTTP message signature input

Idempotency-Keystring · uuidRequired

Idempotency key (UUID)

Responses
202

Successful operation

patch
PATCH /v1/simulator/cards/{cardId}/issue HTTP/1.1
Host: api.offblocks.xyz
Authorization: Bearer JWT
Signature: text
Signature-Input: text
Idempotency-Key: 123e4567-e89b-12d3-a456-426614174000
Accept: */*

No content

If your request was successful, you will receive an empty response with status 202 (Accepted).

In our Sandbox environment the card will be automatically issued and activated, which you can verify by making a GET request to /cards/{cardId}.

Retrieve card

get

Retrieves card's details

Authorizations
Path parameters
cardIdstring · uuidRequired

Unique card ID

Header parameters
SignaturestringRequired

HTTP message signature

Signature-InputstringRequired

HTTP message signature input

Responses
200

Successful operation

application/json
get
GET /v1/cards/{cardId} HTTP/1.1
Host: api.offblocks.xyz
Authorization: Bearer JWT
Signature: text
Signature-Input: text
Accept: */*

{
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "accountId": "123e4567-e89b-12d3-a456-426614174000",
  "type": "virtual",
  "name": "John Carter",
  "network": "visa",
  "maskedPan": "530518******9871",
  "expirationDate": "10/2028",
  "billingAddress": {
    "firstLine": "Flat G",
    "secondLine": "321 West End Lane",
    "city": "London",
    "state": "text",
    "country": "GB",
    "postCode": "NW6 2FG"
  },
  "status": "issuing",
  "createdAt": "2025-08-22T20:29:51.295Z",
  "updatedAt": "2025-08-22T20:29:51.295Z"
}
{
    "accountId": "ae61c362-4136-49af-8e01-544457fe265b",
    "billingAddress": {
        "city": "London",
        "country": "GB",
        "firstLine": "1 Test Avenue",
        "postCode": "SW1 1AA"
    },
    "createdAt": "2024-01-12T15:12:26.923705Z",
    "id": "fc4912aa-cac9-4bb0-a6a7-6ec50bf45879",
    "status": "active",
    "type": "virtual",
    "updatedAt": "2024-01-12T15:16:03.983949Z"
}

From there we can proceed to simulating card authorisations and transactions.

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