In answer to your original question, as someone who has walked from Lisbon to Fatima (and on to Santiago de Compostela of three of those) four times, there is no certificate at the end when you reach the Marian shrine in Cova da Iria, but there...
Hey. It's listed on booking.com as Residecial Celeste (Rua da Misericórdia nº 713 (EN1), 3750-130 Águeda, Portugal). The albergue is attached to it, so although they are technically two different establishments, they are the same place.(To check...
I started in Lisboa and walked all the way. Sure, some sections are more "scenic" than others. My life is like that too and I wouldn't do either of them any differently.
Blessings.
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