The 'pay now, argue later' provisions in sections 36(1), 40(2)(a) and 40(5) of the VAT Act do not unjustifiably infringe the right of access to courts under section 34 of the Constitution. Section 36(1) does not oust judicial jurisdiction but merely prevents automatic suspension of the payment obligation upon noting an appeal to the Special Tax Court; the Commissioner's discretion to suspend payment is reviewable administrative action. Section 40(2)(a) does not constitute impermissible self-help but utilizes ordinary court processes and procedures. Section 40(5) limits challenges to the correctness of assessments (which should be resolved in the Special Tax Court) but does not bar other legal challenges or judicial review on administrative law grounds. To the extent section 40(5) limits access to courts, such limitation is justified under section 36 of the Constitution given the important public purpose, international prevalence of such rules, and the availability of judicial review. Vendors retain access to courts for declaratory relief, review of administrative decisions, and challenges on legal, procedural or constitutional grounds outside the scope of challenging the correctness of assessments.