The SeQura module is a payment gateway type Shopify application and the installation is done via a link. Here is how to install step by step. The screenshots refer to a newly created Shopify store, but the process is very similar for other versions.
1. - Click on the links provided by SeQura:
Installation of the "Pay Later" (SeQura) method: https://www.shopify.com/login?redirect=authorize_gateway%2F1051827.
Installation of the "Part Payment" method (SeQura part payment):
3, 6, 12 => https://www.shopify.com/login?redirect=%2Fadmin%2Fauthorize_gateway%2F1052259
4, 6, 12 => https://www.shopify.com/login?redirect=%2Fadmin%2Fauthorize_gateway%2F1057547Installation of the "Split Payment" method:
FREE => https://www.shopify.com/login?redirect=%2Fadmin%2Fauthorize_gateway%2F1056141
AT COST => https://www.shopify.com/login?redirect=%2Fadmin%2Fauthorize_gateway%2F1056121Installation of "Pay by Card": https://www.shopify.com/login?redirect=%2Fadmin%2Fauthorize_gateway%2F1056205
2.- Access the store where you want to install the modules.
3.- Confirm that you want to install the SeQura module.
4.- From Configuration → Payment providers → Alternative payment methods click on the "Choose alternative payment" button.
5.- On the Alternative Payment Providers page, look for SeQura, the installed modalities will appear: SeQura or SeQura part payment.