I am sorry I was wrong abut the GST is part of the App price.
********* the following is off Apple iTunes Connect
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For developers registered for Goods and Services Tax/Harmonized Sales Tax (GST/HST), please download the PDF file below containing the GST/HST election form (GST506) by which you, the developer, elect to have Apple Canada, Inc. collect, remit and account for GST/HST on the sale of Licensed Applications made on your behalf to end-users in Canada. Kindly complete, sign and return to Apple Canada, Inc. the GST/HST election form following the instructions below. By signing and submitting this form to Apple Canada, Inc., you certify that you have entered your valid GST/HST registration number on the form. For more information, visit the Canada Revenue Agency website at www.cra-arc.gc.ca/. Note: Apple Canada, Inc. may not sell your licensed application to end-users in Canada and you will not be paid for any sales of licensed applications in Canada until this form is properly completed, signed and returned to Apple Canada, Inc.
Pursuant to Schedule 2 of the Developer Agreement, if you do not submit this GST/HST election form to Apple Canada, Inc., you are certifying that you are not registered for GST/HST and are not a resident of and do not carry on business in Canada for GST/HST purposes.
Instructions: Please download the PDF file above containing the GST/HST election form, print, complete and sign the form and return the signed original to Apple Canada, Inc. for its signature. Please ensure that the form is signed by an authorized representative of your company. Following Apple Canada, Inc.’s receipt of the signed forms, Apple Canada, Inc. will send to you a jointly signed and executed copy of the election form which you are required to retain in your records.
Mail signed form to:
Apple Canada, Inc.
c/o Apple Inc.
MS 198-2RA
12545 Riata Vista Circle
Austin, Texas 78727
USA