You can upload Customer receipts in bulk through Data management (available under Workspaces), Data entity for importing the receipt lines is "Customer payment journal line".
I would recommend creating 1 line manually and exporting the Journal from Data management by filtering with specific Journal batch number, use the same Data entity "Customer payment journal line" for exporting. This one line can be used as a base to create other multiple lines. After you've added the other lines, Import the same file via Data management with Data entity "Customer payment journal line".
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