1. From your Shopify admin, click on "Apps" (left menu), then from the drop-down, select MerchMixer - Dropshipping.
2. Click on "Settings" on the left menu, under "MerchMixer - US".
3. Look for the section where it says "Add your billing details". Key in your updated cc information and click on the "Update billing details" button once you're done.
MerchMixer accepts all major debit and credit cards.
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