To create a QR Code via the Bitly API, the associated Short Link must already exist in your account.
Note that links and QR Codes created via the API count towards your monthly limits.
If the link has already been shortened
If you're making a QR Code for an existing link, use the Create a QR Code request.
If the link doesn't exist yet
If it doesn't already exist in your account, a two-step process is required: