§ 69 Charges
(1) Fees and expenses shall be charged for official acts performed under this Act and for statutory instruments issued in enforcement of this Act. ..
(2) The Federal Government shall …determine by statutory instrument the cases which are subject to a fee, the scales of fees, and exemptions and reduced fees, particularly in cases of need. …
(3) The fees which are fixed in the statutory instrument must not exceed the following maximum rates:
1a. for issuance of an EU Blue Card: 140 euros,
3. for the extension of a residence permit or an EU Blue Card: 100 euros, …