Attachments

Typically the POS uploads an electronic receipt after the payment has been confirmed. By the Merchant Agreement, the Merchant is required to provide information of the purchase to the user. This is done by uploading either Receipts or ItemLists to an attachment URI.

How to upload

Attachment URIs are generated by mCASH and are given in the attachment_uri field in the JSON response on certain endpoint. At the moment only the outcome endpoint for payment request exposes such a field. When an attachment URI has been acquired, any number of files can be uploaded by making a POST request formatted as multipart/form-data. This format is described in RFC 2388. However, libraries that are able to make multipart/form-data HTTP requests are readily available for most programming languages.

Note that each upload is "all or nothing". This means that if one or more files fails in a multi-file upload (e.g. due to failed server-side format validation), the entire upload will be discarded by mCASH.

Supported mime-types

The uploaded data is validated according to the Content-Type of the part in the request.

The supported MIME-types and their respective schemas are:

  • 'application/vnd.mcash.itemlist.v1+json'

    mCASH item lists. Will be rendered for the user in the mCASH app.

    store_name : String : optional : default=null
    Information about the Store
    organization_number : String : optional : default=null
    Organization number, e.g. "123456789MVA"
    items[] : Item : optional : default=null
    Items
  • 'application/vnd.mcash.receipt.v1+json'
    cashier : String : optional : default=null
    Seller ID or seller name
    register : String : optional : default=null
    Cash register/POS identifier
    store : Store : optional : default=null
    Information about the Store
    items[] : ReceiptItem : optional : default=null
    Items
    payments[] : ReceiptPayment : optional : default=null
    Payments
    currency : String : optional : default=null
    The currency of amounts on this receipt
    gross : String : optional : default=null
    Gross amount before discounts
    discount : String : optional : default=null
    Discount on the gross
    net : String : optional : default=null
    gross - discount
  • 'image/png'

    No schema, only size restriction of 1 MB.