Register as a TPP

This guide will walk you through the steps to register as a Third-Party Provider (TPP) with bunq. If you're a PSD2-certified company, you'll learn how to authenticate with the bunq API, register your certificate, and start using your credentials to access the data and services you're authorized for.

Pre-Requisite

You must generate a 2048-bit RSA key pair beforehand.
You'll need your QSeal certificate (Qualified Seal Certificate), including intermediate and root certificate chain.
OpenSSL and curl installed
Basic knowledge of command line

The easiest way to register is via command line, but you can also implement this in your code.

You can also use one of our ready-to-go SDKs, just check .

🛠️ Step-by-Step Integration

1. Generate Installation Key Pair

These keys are used to register your app installation with bunq:

# Public key: installation.pub
# Private key: installation.key
openssl genrsa -out installation.key && openssl rsa -in installation.key -outform PEM -pubout -out installation.pub

2. (Sandbox only) Generate a test PSD2 Certificate

The certificate is not validated in sandbox, so you can create as many as you need. Just make sure to use the qSEAL certificate when moving to production.

Replace the subject /CN=.../C=... with your own details as needed.

# Certificate: psd2.cert
# Private key: psd2.key
openssl req -x509 -newkey rsa:4096 -keyout psd2.key -out psd2.cert -days 365 -nodes -subj "/CN=Test PISP AISP $(uuidgen)/C=NL"

3. Create Installation

This step registers your public key with bunq and returns an installation token.

The client_public_key is the public part of the key pair you generated earlier using OpenSSL. This key is sent to bunq so we know how to verify future requests from your integration.

What the API expects here is:

A PEM-formatted public key (typically starting with -----BEGIN PUBLIC KEY----- and ending with -----END PUBLIC KEY-----)
All line breaks and formatting preserved correctly as a single escaped string (so it fits into the JSON payload)

Here's an example of a formatted public key:

"-----BEGIN PUBLIC KEY-----\nMIIBITANBgkqhkiG9w0BAQEFAAOCAQ4AMIIBCQKCAQBKvVUm/gMi7NmTQImtpX1K\nTFMy3BQPvi6uYWMIIy/YHlZNGZbseKyo/dSa22VnFitjoJAt1S6iy04iuiYKCo4p\nUT9jNhn+JW7+U5Ptia6Y1yDwAqioeuL90suO6XLk35Vj7uuyXxlZO3u79/nPJrmp\nmYx2kEhEEISVWd9+TAFrFjImdGVd6DXK4d3D8/tH4GwILcmL7PbigbFLjeCVbkUi\nFqSiMgtQJkHVHhwedwLehuNg/oL3MRBw1bIxrYnjpO6qfyWoYNmCKYo3KgZYrQZ8\nVUjD0bpyfZEWX3+c849nemRdDa8eUZqjzneV2P/m96iiLWbve5KKSklSz2UtCecD\nAgMBAAE=\n-----END PUBLIC KEY-----\n"

You can call the installation endpoint by using the following command line:

INSTALLATION=$(curl -X POST https://public-api.sandbox.bunq.com/v1/installation \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-H "X-Bunq-Client-Request-Id: $(uuidgen)" \
--data "{\"client_public_key\": \"$(awk 'NF {sub(/\r/, ""); printf "%s\\n", $0;}' installation.pub)\"}")

Here is the full specification of the endpoint:

4. Generate the Signature

This proves ownership of your PSD2 certificate by signing the public key and token.

Make sure there is NO new line at the end of the file! Otherwise, the signature will be invalid.

Extract the installation_token from the previous step:

TOKEN=$(echo $INSTALLATION | grep -o '"token":"[A-Za-z0-9]*"' | cut -d '"' -f 4)
echo -n $TOKEN > installation.token

Take the server_public_key of the installation you also received in the previous step.
Append the token
Sign the string using the private key of your PSD2 certificate

openssl dgst -sign psd2.key -keyform PEM -sha256 -out signature <(cat installation.pub installation.token)

This base64 string should be passed as value of client_public_key_signature in the next step.

6. Create Payment Service Provider Credential

Use your certificate and signature to request your TPP credentials in bunq's API.

Here is the command line code:

CREDENTIAL=$(curl -X POST https://public-api.sandbox.bunq.com/v1/payment-service-provider-credential \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-H "X-Bunq-Client-Request-Id: $(uuidgen)" \
-H "X-Bunq-Client-Authentication: $TOKEN" \
--data "{
  \"client_payment_service_provider_certificate\": \"$(awk 'NF {sub(/\r/, ""); printf "%s\\n", $0;}' psd2.cert)\",
  \"client_payment_service_provider_certificate_chain\": \"$(awk 'NF {sub(/\r/, ""); printf "%s\\n", $0;}' psd2.cert)\",
  \"client_public_key_signature\": \"$(cat signature | base64)\"
}")

You can repeat the same value on the client_payment_service_provider_certificate and client_payment_service_provider_certificate_chain in sandbox, but please ensure you have your certificate chain ready when going to production, otherwise the call will fail.

Save the response for the next step:

echo $CREDENTIAL > credential.json

Here is the full specification of the endpoint:

7. Extract Credential Token and register Your Device

After creating a credential in the previous step, you'll receive a credential_token, which acts as a unique secret. This token is required when registering your device using POST /device-server. Registering the device is an important security step—it lets bunq know where the API calls are coming from and links your setup to a specific environment (like your server or app).

By sending the credential token as the secret, you're proving that your device is authorized to operate under your PSD2 certificate and credentials. Without this step, bunq can’t associate API activity with a verified, trusted source.

Here's the bash code to extract your credential_token from the credential.json (saved in the last step):

CREDENTIAL_TOKEN=$(cat credential.json | grep -o '"token_value":"[A-Za-z0-9]*"' | cut -d '"' -f 4)

With that value in hands, you can then call the endpoint POST /device-server and register your device:

curl -X POST https://public-api.sandbox.bunq.com/v1/device-server \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-H "X-Bunq-Client-Request-Id: $(uuidgen)" \
-H "X-Bunq-Client-Authentication: $TOKEN" \
--data "{\"secret\":\"$CREDENTIAL_TOKEN\", \"description\": \"My server\"}"

IP addresses

When using a standard API Key the DeviceServer and Installation that are created in this process are bound to the IP address they are created from.

Using a Wildcard API Key gives you the freedom to make API calls from any IP address after the POST device-server. You can switch to a Wildcard API Key by tapping on “Allow All IP Addresses” in your API Key menu inside the bunq app.

You can also programatically switch to a Wildcard API Key by passing your current ip and a * (asterisk) in the permitted_ips field of the device-server POST call. E.g: ["1.2.3.4", "*"].

Here is the full specification of the endpoint:

9. Sign the Session Request

In this step, you're preparing to create a session with bunq's API, which requires proving your identity using a digital signature.

SESSION_REQUEST_BODY="{\"secret\":\"$CREDENTIAL_TOKEN\"}"
echo -n $SESSION_REQUEST_BODY > session.request

Make sure there is NO new line at the end of the file! Otherwise, the signature will be invalid.

Then you'll digitally sign the contents of the request body using your installation private key. This proves to bunq that the request really comes from someone in control of the private key tied to your public key.

After, you'll encode the binary signature into base64 so it can be safely sent in the signature HTTP header from the next step.

openssl dgst -sign installation.key -keyform PEM -sha256 -out signature < session.request
SESSION_REQUEST_SIGNATURE=$(cat signature | base64)

Troubleshooting

If you get an error telling you "The request signature is invalid", please check the following:

There are no redundant characters (extra spaces, trailing line breaks, etc.) in the data to sign.
Make sure the body is appended to the data to sign exactly as you're adding it to the request.
You have added the full body to the data to sign.
You use the data to sign to create a SHA256 hash signature.
You have base64 encoded the SHA256 hash signature before adding it to the request under X-Bunq-Client-Signature.

11. Create Session (last step, yay!)

The POST /session-server endpoint is used to start a new session with the bunq API. Once your device is registered and you've created a valid credential, this call creates an authenticated session. The session ensures secure, time-limited access to the bunq API on behalf of your registered device and credentials.

curl -X POST https://public-api.sandbox.bunq.com/v1/session-server \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-H "X-Bunq-Client-Request-Id: $(uuidgen)" \
-H "X-Bunq-Client-Signature: $SESSION_REQUEST_SIGNATURE" \
-H "X-Bunq-Client-Authentication: $TOKEN" \
--data "$SESSION_REQUEST_BODY"

The response will contain a session_token. Use this token in the X-Bunq-Client-Authentication header for all subsequent API calls.

Here is the full specification of the endpoint:

✅ You're Ready!

You’ve now successfully authenticated with the bunq Public API as a PSD2-certified provider.

Now you're ready to set up the OAuth with your end user and start using the API in accordance with your certified roles (AISP, PISP, or CBPII).

Please refer to this page on how to set up OAuth:

📝 Reminder

All integration steps must be repeated in the production environment with your real eIDAS certificate when you're ready to go live.

Ready to continue? You can check what you can do with bunq's API according to your role in these pages here:

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POST /v1/installation HTTP/1.1 Host: public-api.sandbox.bunq.com User-Agent: text X-Bunq-Client-Authentication: text Content-Type: application/json Accept: */* Content-Length: 28 { "client_public_key": "text" }

POST /v1/payment-service-provider-credential HTTP/1.1 Host: public-api.sandbox.bunq.com User-Agent: text X-Bunq-Client-Authentication: text Content-Type: application/json Accept: */* Content-Length: 150 { "client_payment_service_provider_certificate": "text", "client_payment_service_provider_certificate_chain": "text", "client_public_key_signature": "text" }

POST /v1/device-server HTTP/1.1 Host: public-api.sandbox.bunq.com User-Agent: text X-Bunq-Client-Authentication: text Content-Type: application/json Accept: */* Content-Length: 63 { "description": "text", "secret": "text", "permitted_ips": [ "text" ] }

POST /v1/session-server HTTP/1.1 Host: public-api.sandbox.bunq.com User-Agent: text X-Bunq-Client-Authentication: text Content-Type: application/json Accept: */* Content-Length: 17 { "secret": "text" }

{ "Id": { "id": 1 }, "Token": { "id": 1, "token": "text" }, "UserCompany": { "name": "text", "public_nick_name": "text", "address_main": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "address_postal": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "language": "text", "region": "text", "country": "text", "ubo": [ { "name": "text", "date_of_birth": "text", "nationality": "text" } ], "chamber_of_commerce_number": "text", "legal_form": "text", "status": "text", "sub_status": "text", "session_timeout": 1, "daily_limit_without_confirmation_login": { "value": "text", "currency": "text" }, "id": 1, "created": "text", "updated": "text", "public_uuid": "text", "display_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "type_of_business_entity": "text", "sector_of_industry": "text", "counter_bank_iban": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "version_terms_of_service": "text", "directors": [ { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" } ], "notification_filters": [ { "notification_delivery_method": "text", "notification_target": "text", "category": "text" } ], "customer": { "billing_account_id": "text", "invoice_notification_preference": "text", "id": 1, "created": "text", "updated": "text" }, "customer_limit": { "limit_monetary_account": 1, "limit_monetary_account_remaining": 1, "limit_card_debit_maestro": 1, "limit_card_debit_mastercard": 1, "limit_card_debit_wildcard": 1, "limit_card_wildcard": 1, "limit_card_replacement": 1, "limit_amount_monthly": { "value": "text", "currency": "text" }, "spent_amount_monthly": { "value": "text", "currency": "text" } }, "billing_contract": [ { "subscription_type": "text", "id": 1, "created": "text", "updated": "text", "contract_date_start": "text", "contract_date_end": "text", "contract_version": 1, "subscription_type_downgrade": "text", "status": "text", "sub_status": "text" } ], "deny_reason": "text", "relations": [ { "user_id": "text", "counter_user_id": "text", "label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "counter_label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "relationship": "text", "status": "text", "user_status": "text", "counter_user_status": "text" } ], "tax_resident": [ { "country": "text", "tax_number": "text", "status": "text", "id": 1 } ] }, "UserPerson": { "first_name": "text", "middle_name": "text", "last_name": "text", "public_nick_name": "text", "address_main": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "address_postal": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "tax_resident": [ { "country": "text", "tax_number": "text", "status": "text", "id": 1 } ], "date_of_birth": "text", "nationality": "text", "all_nationality": [ "text" ], "language": "text", "region": "text", "gender": "text", "status": "text", "sub_status": "text", "session_timeout": 1, "daily_limit_without_confirmation_login": { "value": "text", "currency": "text" }, "display_name": "text", "id": 1, "created": "text", "updated": "text", "public_uuid": "text", "legal_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "place_of_birth": "text", "country_of_birth": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "version_terms_of_service": "text", "notification_filters": [ { "notification_delivery_method": "text", "notification_target": "text", "category": "text" } ], "relations": [ { "user_id": "text", "counter_user_id": "text", "label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "counter_label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "relationship": "text", "status": "text", "user_status": "text", "counter_user_status": "text" } ] }, "UserApiKey": { "id": 1, "created": "text", "updated": "text", "requested_by_user": { "UserPerson": { "first_name": "text", "middle_name": "text", "last_name": "text", "public_nick_name": "text", "address_main": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "address_postal": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "tax_resident": [ { "country": "text", "tax_number": "text", "status": "text", "id": 1 } ], "date_of_birth": "text", "nationality": "text", "all_nationality": [ "text" ], "language": "text", "region": "text", "gender": "text", "status": "text", "sub_status": "text", "session_timeout": 1, "daily_limit_without_confirmation_login": { "value": "text", "currency": "text" }, "display_name": "text", "id": 1, "created": "text", "updated": "text", "public_uuid": "text", "legal_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "place_of_birth": "text", "country_of_birth": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "version_terms_of_service": "text", "notification_filters": [ { "notification_delivery_method": "text", "notification_target": "text", "category": "text" } ], "relations": [ { "user_id": "text", "counter_user_id": "text", "label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "counter_label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "relationship": "text", "status": "text", "user_status": "text", "counter_user_status": "text" } ] }, "UserCompany": { "name": "text", "public_nick_name": "text", "address_main": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "address_postal": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "language": "text", "region": "text", "country": "text", "ubo": [ { "name": "text", "date_of_birth": "text", "nationality": "text" } ], "chamber_of_commerce_number": "text", "legal_form": "text", "status": "text", "sub_status": "text", "session_timeout": 1, "daily_limit_without_confirmation_login": { "value": "text", "currency": "text" }, "id": 1, "created": "text", "updated": "text", "public_uuid": "text", "display_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "type_of_business_entity": "text", "sector_of_industry": "text", "counter_bank_iban": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "version_terms_of_service": "text", "directors": [ { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" } ], "notification_filters": [ { "notification_delivery_method": "text", "notification_target": "text", "category": "text" } ], "customer": { "billing_account_id": "text", "invoice_notification_preference": "text", "id": 1, "created": "text", "updated": "text" }, "customer_limit": { "limit_monetary_account": 1, "limit_monetary_account_remaining": 1, "limit_card_debit_maestro": 1, "limit_card_debit_mastercard": 1, "limit_card_debit_wildcard": 1, "limit_card_wildcard": 1, "limit_card_replacement": 1, "limit_amount_monthly": { "value": "text", "currency": "text" }, "spent_amount_monthly": { "value": "text", "currency": "text" } }, "billing_contract": [ { "subscription_type": "text", "id": 1, "created": "text", "updated": "text", "contract_date_start": "text", "contract_date_end": "text", "contract_version": 1, "subscription_type_downgrade": "text", "status": "text", "sub_status": "text" } ], "deny_reason": "text", "relations": [ { "user_id": "text", "counter_user_id": "text", "label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "counter_label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "relationship": "text", "status": "text", "user_status": "text", "counter_user_status": "text" } ], "tax_resident": [ { "country": "text", "tax_number": "text", "status": "text", "id": 1 } ] }, "UserPaymentServiceProvider": { "id": 1, "created": "text", "updated": "text", "certificate_distinguished_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "status": "text", "sub_status": "text", "public_uuid": "text", "display_name": "text", "public_nick_name": "text", "language": "text", "region": "text", "session_timeout": 1 } }, "granted_by_user": { "UserPerson": { "first_name": "text", "middle_name": "text", "last_name": "text", "public_nick_name": "text", "address_main": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "address_postal": { "street": "text", "house_number": "text", "po_box": "text", "postal_code": "text", "city": "text", "country": "text", "extra": "text", "mailbox_name": "text", "province": "text", "is_user_address_updated": true }, "tax_resident": [ { "country": "text", "tax_number": "text", "status": "text", "id": 1 } ], "date_of_birth": "text", "nationality": "text", "all_nationality": [ "text" ], "language": "text", "region": "text", "gender": "text", "status": "text", "sub_status": "text", "session_timeout": 1, "daily_limit_without_confirmation_login": { "value": "text", "currency": "text" }, "display_name": "text", "id": 1, "created": "text", "updated": "text", "public_uuid": "text", "legal_name": "text", "alias": [ { "type": "text", "value": "text", "name": "text" } ], "place_of_birth": "text", "country_of_birth": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "version_terms_of_service": "text", "notification_filters": [ { "notification_delivery_method": "text", "notification_target": "text", "category": "text" } ], "relations": [ { "user_id": "text", "counter_user_id": "text", "label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", "content_type": "text", "height": 1, "width": 1 } ], "style": "text" }, "public_nick_name": "text" }, "counter_label_user": { "uuid": "text", "display_name": "text", "country": "text", "avatar": { "uuid": "text", "anchor_uuid": "text", "image": [ { "attachment_public_uuid": "text", 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