a

alphabetical

as

alphabetical with special characters

n

numeric

an

alphanumeric

ans

alphanumeric with special characters

ns

numeric with special characters

bool

boolean expression (true or false)

3

fixed length with 3 digits/characters

..3

variable length with maximum 3 digits/characters

enum

enumeration of allowed values

dttm

ISODateTime (YYYY-MM-DDThh:mm:ss)

CND

condition

M

mandatory

O

optional

C

conditional

https://www.computop-paygate.com/CetelemPresto.aspx

MerchantID

ans..30

M

ID of merchant. Additionally this parameter has to be passed in plain language too.

TransID

ans..64

M

Merchant's transaction number, which shall be unique for each payment

RefNr

an..13

C

Supplementary transaction identifier. Only the following characters are allowed:

• Alphabetical letters [A-Za-z] (from A to Z lower or upper case)
• Numbers [0-9] (from 0 to 9)

Notice: If RefNr is not present, TransID will be used instead. Therefore in such case TransID should meet format and length of RefNr.

Amount

n..10

M

Amount in the smallest currency unit (e.g. EUR Cent)

Please contact the helpdesk, if you want to capture amounts <100 (smallest currency unit).

Currency

a3

M

Currency, three digits DIN / ISO 4217. Only EUR is permissible.

MAC

an64

M

Hash Message Authentication Code (HMAC) with SHA-256 algorithm

URLSuccess

ans..256

M

Complete URL which calls up Paygate if payment has been successful. The URL may be called up only via port 443 This URL may not contain parameters: In order to exchange values between Paygate and shop, please use the parameter UserData.

URLFailure

ans..256

M

Complete URL which calls up Paygate if payment has been unsuccessful. The URL may be called up only via port 443 This URL may not contain parameters: In order to exchange values between Paygate and shop, please use the parameter UserData.

Response

a7

O

Status response sent by Paygate to URLSuccess and URLFailure, should be encrypted. For this purpose, transmit Response=encrypt parameter.

URLNotify

ans..256

M

Complete URL which Paygate calls up in order to notify the shop about the payment result. The URL may be called up only via port 443 It may not contain parameters: Use the UserData parameter instead.

UserData

ans..1024

O

If specified at request, Paygate forwards the parameter with the payment result to the shop

ReqID

ans..32

O

To avoid double payments, enter an alphanumeric value which identifies your transaction and may be assigned only once. If the transaction is submitted again with the same ReqID, Paygate will not carry out the payment, but will just return the status of the original transaction. Please note that the Paygate must have a finalized transaction status for the first initial action. Submissions with identical ReqID for an open status will be processed regularly.

Plain

ans..50

O

A value to be set by the merchant to return some information unencrypted, e.g. the MID

Custom

ans..1024

O

The merchant can submit several values separated by | which are returned unencrypted and separated by &.

Custom=session=123|id=456 will change in the answer to Session=123&id=456

MID

ans..30

M

ID of merchant, assigned by Computop

PayID

an32

M

ID assigned by Paygate for the payment, e.g. for referencing in batch files

XID

an32

M

ID for all single transactions for one payment assigned by Paygate

TransID

ans..64

M

Merchant’s transaction number

RefNr

an..13

C

Supplementary transaction identifier. Only the following characters are allowed:

• Alphabetical letters [A-Za-z] (from A to Z lower or upper case)
• Numbers [0-9] (from 0 to 9)

Notice: If RefNr is not present, TransID will be used instead. Therefore in such case TransID should meet format and length of RefNr.

Status

a..30

M

OK or AUTHORIZE_REQUEST in the case of URLSuccess and FAILED in the case of URLFailure

Description

ans..1024

M

Further details in the event that payment is rejected. Please do not use the Description but the Code parameter for the status analysis!

Code

n8

M

Error code according to Paygate Response Codes (A4 Error codes)

MAC

an64

M

Hash Message Authentication Code (HMAC) with SHA-256 algorithm

UserData

ans..1024

O

If specified at request, Paygate forwards the parameter with the payment result to the shop

TransactionID

ans..32

M

Cetelem contract number

ans..256

O

External error code

Plain

ans..50

O

A value to be set by the merchant to return some information unencrypted, e.g. the MID

Custom

ans..1024

O

The merchant can submit several values separated by | which are returned unencrypted and separated by &.

Custom=session=123|id=456 will change in the answer to Session=123&id=456

https://www.computop-paygate.com/credit.aspx

MerchantID

ans..30

M

ID of merchant. Additionally this parameter has to be passed in plain language too.

PayID

an32

M

ID assigned by Paygate for the payment to be credited

TransID

ans..64

M

ID assigned by Merchant for the payment process to be credited

Amount

n..10

M

Amount in the smallest currency unit (e.g. EUR Cent)

Please contact the helpdesk, if you want to capture amounts < 100 (smallest currency unit).

Currency

a..3

M

Currency code, three digits DIN / ISO 4217

MAC

an64

M

Hash Message Authentication Code (HMAC) with SHA-256 algorithm

MID

ans..30

M

ID of merchant, assigned by Computop

PayID

an32

M

ID assigned by Paygate for the payment, e.g. for referencing in batch files

XID

an32

M

ID for all single transactions (authorisation, capture, credit note) for one payment assigned by Paygate

TransID

ans..64

M

Merchant’s transaction number

Status

a..30

M

OK or FAILED

Description

ans..1024

M

Further details in the event that payment is rejected. Please do not use the Description but the Code parameter for the transaction status analysis!

Code

n8

M

Error code according to Paygate Response Codes (A4 Error codes)